Document:

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                                                                     EXHIBIT 4.1

                             VICOM INCORPORATED

                          CERTIFICATE OF DESIGNATION
                                    OF THE
                 RELATIVE RIGHTS, RESTRICTIONS AND PREFERENCES
                                      OF
               8% CLASS A CUMULATIVE CONVERTIBLE PREFERRED STOCK
                                      AND
              10% CLASS B CUMULATIVE CONVERTIBLE PREFERRED STOCK

    Pursuant to Section 302A.401 of the Minnesota Business Corporations Act

                               -----------------

     The undersigned, as the Chief Executive Officer of Vicom Incorporated, a
Minnesota corporation (the "Corporation"), hereby certifies that on the 9th
day of December, 1998, the following resolutions were adopted by the Board of
Directors of the Corporation for the purpose of designating a portion of the
Corporation's authorized but unissued capital stock as Preferred Stock and
establishing two classes of Preferred Stock designated as "8% Class A
Cumulative Convertible Preferred Stock" and "10% Class B Cumulative
Convertible Preferred Stock":

     "RESOLVED, that pursuant to authority granted to and vested in the Board
     of Directors by the laws of the State of Minnesota and the Corporation's
     Articles of Incorporation, as amended and restated, the Board of Directors
     hereby establishes the following classes of capital stock:

     A.   Two Hundred Seventy-five Thousand (275,000) shares of the
          Corporation's authorized but unissued capital stock shall be Preferred
          Stock, with no par value per share, designated as "8% Class A
          Cumulative Convertible Preferred Stock";

     B.   Sixty Thousand (60,000) shares of the Corporation's authorized but
          unissued capital stock shall be Preferred Stock, with no par value
          per share, designated as "10% Class B Cumulative Convertible
          Preferred Stock"; and

     C.   The remaining balance of the Corporation's authorized but unissued
          capital stock shall be undesignated as to class or series.

     FURTHER RESOLVED, that the 8% Class A Cumulative Convertible Preferred
     Stock and the 10% Class B Cumulative Convertible Preferred Stock shall
     have the relative rights, restrictions and preferences set forth in
     APPENDIX A attached hereto."

     IN WITNESS WHEREOF, I have hereunder subscribed my name this 9th day of
     December, 1998.

                                            /s/ James L. Mandel
                                            ----------------------------------
                                            James L. Mandel
                                            Chief Executive Officer

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                                                                      APPENDIX A

                              VICOM INCORPORATED

               8% CLASS A CUMULATIVE CONVERTIBLE PREFERRED STOCK
                                      AND
              10% CLASS B CUMULATIVE CONVERTIBLE PREFERRED STOCK

     The total number of shares of all classes of capital stock which the
Corporation is authorized to issue is Fifty Million (50,000,000). The shares
of capital stock of the Corporation shall include a class of preferred stock
consisting of Two Hundred Seventy-five Thousand (275,000) shares, which shall
be designated 8% Class A Cumulative Convertible Preferred Stock with no par
value per share ("Class A Preferred"), and a second class of preferred stock
consisting of Sixty Thousand (60,000) shares, which shall be designated 10%
Class B Cumulative Convertible Preferred Stock with no par value per share
("Class B Preferred"). The balance of the Corporation's authorized but
unissued capital stock shall be undesignated capital stock. The rights,
preferences, privileges, restrictions and other matters relating to the Class
A Preferred Stock and Class B Preferred Stock are as follows:

     1.  DIVIDENDS.  Holders of the Class A Preferred and Class B Preferred
shall be entitled to receive, when and as declared by the Board of Directors
out of funds legally available therefor, cumulative cash dividends at the
rates set forth below in paragraphs 1A and 1B, respectively. For purposes of
calculating the dividends payable on the Class A Preferred and Class B
Preferred, each share of Class A Preferred and Class B Preferred shall be
valued at $10.00 per share (appropriately adjusted for stock dividends, stock
splits, reverse stock splits, and other subdivisions and combinations of
Class A Preferred and Class B Preferred) (such per share price, as it may be
adjusted, for the Class A Preferred and Class B Preferred is referred to
herein as the "Dividend Price"). All dividends payable pursuant to this
Section 1 shall be referred to as "Preferred Dividends."

         A.  CLASS A PREFERRED.  The holders of shares of Class A Preferred
     shall be entitled to receive, when and as declared by the Board of
     Directors of the Corporation out of assets of the Corporation legally
     available for payment thereof, cumulative cash dividends on the Dividend
     Price then in effect for the Class A Preferred at the per annum rate,
     computed on the basis of actual days over a 365-day year, of eight percent
     (8%) per annum. Such dividends shall be payable upon declaration quarterly
     on March 31, June 30, September 30 and December 31 of each year,
     commencing for any share of Class A Preferred on the first of such dates
     to occur after that share is issued.

         B.  CLASS B PREFERRED.  The holders of shares of Class B Preferred
     shall be entitled to receive, when and as declared by the Board of
     Directors of the Corporation out of assets of the Corporation legally
     available for payment thereof, cumulative cash dividends on the Dividend
     Price then effect for the Class B Preferred at the per annum rate,
     computed on the basis of actual days over a 365-day year, of ten percent
     (10%) per annum. Such dividends shall be payable upon declaration monthly
     on the first day of each calendar month, commencing for any share of
     Class B Preferred on the first day of a calendar month to occur after such
     share is issued.

         C.  ACCRUAL; PAYMENT.  The Preferred Dividends on the Class A
     Preferred and Class B Preferred shall accrue cumulatively on a daily basis
     from and as of the date of original issuance of the Class A Preferred and
     Class B Preferred until such time as the Class A Preferred and Class B
     Preferred are redeemed or converted, whether or not declared and whether
     or not any funds of the Corporation are legally available for the payment
     of dividends. Preferred Dividends shall be payable to holders of record of
     the Class A Preferred and Class B Preferred as they appear on the books of
     the Corporation on the record date determined by the Board of Directors.
     Preferred

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     Dividends payable for the initial dividend period shall be based on the
     amount of dividends accrued since the date of issuance of the Class A
     Preferred and Class B Preferred.

     2.  DIVIDEND PRIORITIES.  No dividend payments shall be paid or declared
and set apart for payment on any other shares of stock of the Corporation,
whether common or preferred, for any period, and no other shares of the
Corporation, whether common or preferred, shall be redeemed or purchased by
the Corporation, unless all Preferred Dividends have been paid or
contemporaneously are declared and paid on the Class A Preferred and Class B
Preferred for such period. Except as provided in Section 1 above, holders of
the Class A Preferred and Class B Preferred shall not be entitled to any
dividends, whether payable in cash, property or stock, in excess of the full
Preferred Dividends for any period. No interest, or sum of money in lieu of
interest, shall be payable in respect of any Preferred Dividend payments or
payment which may be in arrears. If at any time the Corporation pays less
than the total amount of Preferred Dividends then accrued with respect to the
Class A Preferred and Class B Preferred, such payment shall be distributed
ratably among the holders of Class A Preferred and Class B Preferred based
upon the aggregate accrued but unpaid dividends on the shares of Class A
Preferred and Class B Preferred held by each such holder on the record date
fixed by the Board of Directors for the payment of such dividend. The Board
of Directors, in its discretion, may declare and pay dividends on the common
stock or other capital stock of the Corporation, provided that all accumulated
Preferred Dividends on the Class A Preferred and Class B Preferred for the
current and all previous dividend periods have been paid in full. In the
event that, for a given year, the dividends declared on the common stock of
the Corporation exceed, on a per share basis, the year to date per share
Preferred Dividends accrued, declared and paid on the Class A Preferred and
Class B Preferred, the Class A Preferred and Class B Preferred shall
participate in and shall receive a pro rata share of the excess amount. Such
allocation shall be adjusted as appropriate to account for any change in the
capitalization of the Corporation occurring after the date hereof, whether
resulting from a recapitalization, stock dividend, stock split, reverse stock
split or otherwise.

     3.  LIQUIDATION PREFERENCES.

         A.  Upon any liquidation, dissolution or winding up of the Corporation,
     whether voluntary or involuntary, the holders of the shares of Class A
     Preferred and Class B Preferred shall be entitled, after payment or
     provision for all debts and liabilities of the Corporation and before any
     distribution or payment is made upon any other shares of capital stock of
     the Corporation, to be paid an amount per share equal to the sum of
     (i) $10.50 per share (appropriately adjusted for stock dividends, stock
     splits, reverse stock splits, and other subdivisions and combinations of
     Class A Preferred and Class B Preferred) (such per share price, as
     adjusted, for the Class A Preferred and Class B Preferred is referred to
     herein as the "Preferred Price") plus (ii) accrued and unpaid Preferred
     Dividends due under Section 1 above. (Such total sum of the amounts
     payable referred to in clauses (i) and (ii) being sometimes referred to
     herein as the "Preferential Amount.") If upon such liquidation, dissolution
     or winding up of the Corporation, whether voluntary or involuntary, the
     assets to be distributed among the holders of Class A Preferred and Class B
     Preferred shall be insufficient to permit payment to the holders of Class A
     Preferred and Class B Preferred of the amount distributable as aforesaid,
     then all of the assets of the Corporation remaining to be so distributed
     shall be distributed ratably (a) first among the holders of the shares of
     Class A Preferred and Class B Preferred so that the same percentage of the
     Preferred Price for each share of Class A Preferred and Class B Preferred
     is paid with respect to each such share, until the full amount of the
     Preferred Price has been paid; and (b) then among the holders of the shares
     of Class A Preferred and Class B Preferred so that the same percentage of
     the Preferred Dividends for each share of Class A Preferred and Class B
     Preferred is paid with respect to each such share, until the full amount of
     the Preferred Dividends has been paid.

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          B.   Upon any such liquidation, dissolution or winding up of the
     Corporation, after the holders of Class A Preferred and Class B
     Preferred shall have been paid in full the amounts to which they shall be
     entitled, the remaining net assets of the Corporation may be distributed
     pro rata to the holders of shares of common stock of the Corporation;
     provided that in the event that, upon liquidation and dissolution of the
     Corporation, the amounts distributed to the holders of the shares of
     common stock of the Corporation exceed, on a per share basis, the amount
     of the Preferential Amount, the holders of the Class A Preferred and
     Class B Preferred shall participate in and shall receive a pro rata share
     of the excess.

          C.   Written notice of such liquidation, dissolution or winding up,
     stating a payment date, the amount of the Preferential Amount and the place
     where said Preferential Amount shall be payable, shall be delivered in
     person, mailed by certified or registered mail, return receipt requested,
     or sent by telecopier or telex, not less than twenty (20) business days
     prior to the payment date stated therein, to the holders of record of Class
     A Preferred and Class B Preferred, such notice to be addressed to each such
     holder at its address as shown by the records of the Corporation. The
     consolidation or merger of the Corporation into or with any other entity or
     entities which results in the exchange of outstanding shares of the
     Corporation for securities or other consideration issued or paid or caused
     to be issued or paid by any such entity or affiliate thereof, and the sale,
     lease, abandonment, transfer or other disposition by the Corporation of all
     or substantially all its assets, shall be deemed to be a liquidation,
     dissolution or winding up of the Corporation within the meaning of the
     provisions of this Section 3.

     4.   VOTING RIGHTS. The Class A Preferred and the Class B Preferred are
non-voting, except as may otherwise be required by law.

     5.   CONVERSIONS. The holders of shares of Class A Preferred and Class B
Preferred shall have the following conversion rights:

          A.   RIGHT TO CONVERT. Subject to the terms and conditions of this
     Section 5, the holder of any share or shares of Class A Preferred or Class
     B Preferred shall have the right, at his or her option at any time, to
     convert any such share or shares of Class A Preferred or Class B Preferred
     (except that upon any liquidation of the Corporation the right of
     conversion shall terminate at the close of business on the business day
     prior to the date fixed for payment of the amount distributable on Class A
     Preferred or Class B Preferred) into five (5) fully paid and nonassessable
     shares of the Corporation's common stock, no par value per share (the
     "Common Stock"), or, in case an adjustment has taken place pursuant to the
     further provisions of this Section 5, then by the conversion ratio as last
     adjusted and in effect at the date any share or shares of Class A Preferred
     or Class B Preferred are surrendered for conversion (such ratio, or such
     ratio as last adjusted, being referred to as the "Conversion Ratio"). Such
     rights of conversion shall be exercised by the holder thereof by giving
     written notice that the holder elects to convert a stated number of shares
     of Class A Preferred or Class B Preferred into Common Stock and by
     surrender of a certificate or certificates for the shares so to be
     converted to the Corporation at its principal office (or such other office
     or agency of the Corporation as the Corporation may designate by notice in
     writing to the holders of Class A Preferred and Class B Preferred) at any
     time during its usual business hours on the date set forth in such notice,
     together with a statement of the name or names (with address) in which the
     certificate or certificates for shares of Common Stock shall be issued.

          B.   ISSUANCE OF CERTIFICATES; TIME CONVERSION EFFECTED. Promptly
     after the receipt of the written notice referred to in paragraph 5A and
     surrender of the certificate or certificates for

                                       3
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     the share or shares of Class A Preferred or Class B Preferred to be
     converted, the Corporation shall issue and deliver, or cause to be issued
     and delivered, to the holder, registered in such name or names as such
     holder may direct, a certificate or certificates for the number of whole
     shares of Common Stock issuable upon the conversion of such share or shares
     of Class A Preferred or Class B Preferred. To the extent permitted by law,
     such conversion shall be deemed to have been effected and the Conversion
     Ratio shall be determined as of the close of business on the date on which
     such written notice shall have been received by the Corporation and the
     certificate or certificates for such share or shares shall have been
     surrendered as aforesaid, and at such time the rights of the holder of such
     share or shares of Class A Preferred or Class B Preferred shall cease, and
     the person or persons in whose name or names any certificate or
     certificates for shares of Common Stock shall be issuable upon such
     conversion shall be deemed to have become the holder or holders of record
     of the shares represented thereby.

          C.   FRACTIONAL SHARES: DIVIDENDS; PARTIAL CONVERSION. No fractional
     shares shall be issued upon conversion of Class A Preferred or Class B
     Preferred into Common Stock and no payment or adjustment shall be made upon
     any conversion on account of any cash dividends on the Common Stock issued
     upon such conversion. At the time of each conversion, the Corporation shall
     pay in cash an amount equal to all dividends declared pursuant to Section 1
     above and unpaid on the shares of Class A Preferred or Class B Preferred
     surrendered for conversion to the date upon which such conversion is deemed
     to take place as provided in paragraph 5B. In case the number of shares of
     Class A Preferred or Class B Preferred represented by the certificate or
     certificates surrendered pursuant to subparagraph 5A exceeds the number of
     shares converted, the Corporation shall, upon such conversion, execute and
     deliver to the holder, at the expense of the Corporation, a new certificate
     or certificates for the number of shares of Class A Preferred or Class B
     Preferred represented by the certificate or certificates surrendered which
     are not to be converted. If any fractional share of Common Stock would,
     except for the provisions of the first sentence of this paragraph 5C, be
     delivered upon such conversion, the Corporation, in lieu of delivering such
     fractional share, shall pay to the holder surrendering Class A Preferred or
     Class B Preferred for conversion an amount in cash equal to the current
     market price of such fractional share as determined in good faith by the
     Board of Directors of the Corporation.

          D.   STOCK DIVIDENDS, SUBDIVISION OR COMBINATION OF COMMON STOCK.  In
     case the Corporation shall, after the date on which the Class A Preferred
     and Class B Preferred are first issued by the Corporation (the "Original
     Issue Date"), at any time subdivide (by any stock split, stock dividend or
     otherwise) its outstanding shares of Common Stock into a greater number of
     shares, the Conversion Ratio in effect immediately prior to such
     subdivision shall be proportionately increased, and, conversely, in case
     the outstanding shares of Common Stock shall be combined into a smaller
     number of shares, the Conversion Ratio in effect immediately prior to such
     combination shall be proportionately reduced.

          E.   REORGANIZATION OR RECLASSIFICATION. If any capital reorganization
     or reclassification of the capital stock of the Corporation shall be
     effected after the Original Issue Date in such a way that holders of Common
     Stock shall be entitled to receive stock, securities or assets with respect
     to or in exchange for Common Stock, then, as a condition of such
     reorganization or reclassification, lawful and adequate provisions shall
     be made whereby each holder of a share or shares of Class A Preferred or
     Class B Preferred shall thereupon have the right to receive, upon the basis
     and upon the terms and conditions specified herein and in lieu of the
     shares of Common Stock immediately theretofore receivable upon the
     conversion of such share or shares of Class A Preferred or Class B
     Preferred, such shares of stock, securities or assets as may be issued or
     payable with respect to or in exchange for a number of outstanding shares
     of such Common Stock equal to the number of shares of such Common Stock
     immediately

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<PAGE>

     theretofore receivable upon such conversion had such reorganization or
     reclassification not taken place, and in any such case appropriate
     provisions shall be made with respect to the rights and interests of
     such holder to the end that the provisions hereof (including, without
     limitation, provisions for adjustments of the Conversion Ratio) shall
     thereafter be applicable, as nearly as may be, in relation to any shares
     of stock, securities or assets thereafter deliverable upon the exercise
     of such conversion rights.

          F.   NOTICE OF ADJUSTMENT.  Upon any adjustment of the Conversion
     Ratio, then and in each such case the Corporation shall give written notice
     thereof, by delivery in person, certified or registered mail, return
     receipt requested, telecopier or telex, addressed to each holder of
     shares of Class A Preferred or Class B Preferred at the address of such
     holder as shown on the books of the Corporation, which notice shall
     state the Conversion Ratio resulting from such adjustment, setting forth
     in reasonable detail the method upon which such calculation is based.

          G.   OTHER NOTICES.  In case at any time:

               (1)  the Corporation shall declare any dividend upon its
          Common Stock payable in stock or make any other distribution to the
          holders of its Common Stock;

               (2)  the Corporation shall offer for subscription pro rata to
          the holders of its Common Stock any additional shares of stock of
          any class or other rights;

               (3)  there shall be any capital reorganization or
          reclassification of the capital stock of the Corporation, or a
          consolidation or merger of the Corporation with or into another
          entity or entities, or a sale, lease, abandonment, transfer or
          other disposition of all or substantially all its assets; or

               (4)  there shall be a voluntary or involuntary dissolution,
          liquidation or winding up of the Corporation;

     then, in any one or more of said cases, the Corporation shall give, by
     delivery in person, certified or registered mail, return receipt
     requested, telecopier or telex, addressed to each holder of any shares of
     Class A Preferred or Class B Preferred at the address of such holder as
     shown on the books of the Corporation, (a) at least 20 days' prior
     written notice of the date on which the books of the Corporation shall
     close or a record shall be taken for such dividend, distribution or
     subscription rights or for determining rights to vote in respect of any
     such reorganization, reclassification, consolidation, merger,
     disposition, dissolution, liquidation or winding up and (b) in the case
     of any such reorganization, reclassification, consolidation, merger,
     disposition, dissolution, liquidation or winding up, at least 20 days'
     prior written notice of the date when the same shall take place. Such
     notice in accordance with the foregoing clause (a) shall also specify, in
     the case of any such dividend, distribution or subscription rights, the
     date on which the holders of Common Stock shall be entitled thereto and
     such notice in accordance with the foregoing clause (b) shall also
     specify the date on which the holders of Common Stock shall be entitled
     to exchange their Common Stock for securities or other property
     deliverable upon such reorganization, reclassification, consolidation,
     merger, disposition, dissolution, liquidation or winding up, as the case
     may be.

          H.   STOCK TO BE RESERVED.  The Corporation will at all times
     reserve and keep available out of its authorized Common Stock, solely
     for the purpose of issuance upon the conversion of Class A Preferred and
     Class B Preferred as herein provided, such number of shares of Common
     Stock as shall then be issuable upon the conversion of all outstanding
     shares of Class

                                       5

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     A Preferred and Class B Preferred.  The Corporation covenants that all
     shares of Common Stock which shall be so issued shall be duly and
     validly issued and fully paid and nonassessable and free from all
     transfer taxes, liens and charges with respect to the issue thereof.
     The Corporation will take all such action as may be necessary to assure
     that all such shares of Common Stock may be so issued without violation
     of any applicable law or regulation, or of any requirement of any
     national securities exchange upon which the Common Stock may be listed.

          I.  NO REISSUANCE OF CLASS A PREFERRED AND CLASS B PREFERRED.
     Shares of Class A Preferred and Class B Preferred which are converted
     into shares of Common Stock as provided herein shall not be reissued.

          J.  ISSUE TAX.  The issuance of certificates for shares of Common
     Stock upon conversion of Class A Preferred and Class B Preferred shall
     be made without charge to the holders thereof for any issuance tax in
     respect thereof, provided that the Corporation shall not be required to
     pay any tax which may be payable in respect of any transfer involved in
     the issuance and delivery of any certificate in a name other than that
     of the holder of Class A Preferred and Class B Preferred which is being
     converted.

          K.  CLOSING OF BOOKS.  Except as required by an underwriter in
     connection with a public offering, the Corporation will at no time close
     its transfer books against the transfer of any Class A Preferred or
     Class B Preferred or of any shares of Common Stock issued or issuable
     upon the conversion of any shares of Class A Preferred or Class B
     Preferred in any manner which interferes with the timely conversion of
     such Class A Preferred and Class B Preferred, except as may otherwise be
     required to comply with applicable securities laws.

     6.   REDEMPTION.  The Corporation shall have the right to redeem the
outstanding shares of Class A Preferred and Class B Preferred, in whole or in
part, at a redemption price of $10.50 per share (appropriately adjusted for
stock dividends, stock splits, reverse stock splits, and other subdivisions
and combinations of Class A Preferred or Class B Preferred) plus any earned
and unpaid Preferred Dividends, or not less than thirty (30) calendar days'
notice ("Corporate Notice") to the holders of the Class A Preferred or Class
B Preferred.  The Corporation shall be entitled to redeem the Class A
Preferred and the Class B Preferred as provided in this Paragraph 6 only if
the closing bid price of the Common Stock exceeds $4.00 per share
(appropriately adjusted for stock dividends, stock splits, reverse stock
splits and other subdivisions and combinations of Common Stock) for any ten
(10) consecutive trading days prior to the date of the Corporate Notice.
Upon receipt of Corporate Notice, the holders of the Class A Preferred and
Class B Preferred to be redeemed will have the option to convert each share
of Class A Preferred and Class B Preferred into five (5) shares of Common Stock
(subject to adjustment as set forth in Section 5 above) until the close of
business on the date fixed for redemption, unless extended by the Corporation
in its sole discretion.  All shares of Class A Preferred and Class B
Preferred called for redemption which are not so converted will be redeemed.
Each holder of shares of Class A Preferred and Class B Preferred to be
redeemed shall surrender the certificate or certificates representing such
shares to the Corporation at the place designated in the Corporate Notice,
and thereupon the applicable redemption price for such shares as set forth in
this Section 6 shall be paid to the order of the person whose name appears on
such certificate or certificates and each surrendered certificate shall be
canceled and retired.  Holders of Class A Preferred and Class B Preferred
shall not have the right to require the Corporation to redeem their shares of
Class A Preferred or Class B Preferred.

                                                                          [SEAL]

                                       6<PAGE>

                                                                     Exhibit 4.2

                                                           Certificate No. W-___

                                    WARRANT

                 TO PURCHASE __________ SHARES OF COMMON STOCK
                                       OF
                               VICOM, INCORPORATED

         THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT
         HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE "1933
         ACT") OR UNDER ANY STATE SECURITIES OR "BLUE SKY" LAWS ("BLUE SKY
         LAWS"). NO TRANSFER, SALE, ASSIGNMENT, PLEDGE, HYPOTHECATION OR OTHER
         DISPOSITION OF THIS WARRANT OR THE SECURITIES ISSUABLE UPON EXERCISE OF
         THIS WARRANT OR ANY INTEREST THEREIN MAY BE MADE EXCEPT (a) PURSUANT TO
         AN EFFECTIVE REGISTRATION STATEMENT UNDER THE 1933 ACT AND ANY
         APPLICABLE BLUE SKY LAWS OR (b) IF THE CORPORATION HAS BEEN FURNISHED
         WITH AN OPINION OF COUNSEL FOR THE HOLDER, WHICH OPINION AND COUNSEL
         SHALL BE REASONABLY SATISFACTORY TO THE CORPORATION, TO THE EFFECT THAT
         NO REGISTRATION IS REQUIRED BECAUSE OF THE AVAILABILITY OF AN EXEMPTION
         FROM REGISTRATION UNDER THE 1933 ACT AND APPLICABLE BLUE SKY LAWS.

                  THIS CERTIFIES THAT, for good and valuable consideration
_______________ (the "Holder"), or the Holder's registered assigns, is entitled
to subscribe for and purchase from Vicom, Incorporated, a Minnesota corporation
(the "Corporation"), at any time after ___________, 199_, to and including
____________, 200_, ___________ (____________) fully paid and nonassessable
shares of the Common Stock of the Corporation at the price of $3.00 per share
(the "Warrant Exercise Price"), subject to the antidilution provisions of this
Warrant.

                  The shares which may be acquired upon exercise of this
Warrant are referred to herein as the "Warrant Shares." As used herein, the
term "Holder" means the Holder, any party who acquires all or a part of this
Warrant as a registered transferee of the Holder, or any record holder or
holders of the Warrant Shares issued upon exercise, whether in whole or in
part, of the Warrant. The term "Common Stock" means the common stock, no par
value per share, of the Corporation. This Warrant is part of a series of
Warrants (the "Series") issued in connection with a private placement by the
Corporation pursuant to the Corporation's Confidential Private Placement
Memorandum dated December 9, 1998.

                  This Warrant is subject to the following provisions, terms and
conditions:

         1. EXERCISE; TRANSFERABILITY.

<PAGE>

                  (a) The rights represented by this Warrant may be exercised by
the Holder hereof, in whole or in part (but not as to a fractional share of
Common Stock), by written notice of exercise (in the form attached hereto)
delivered to the Corporation at the principal office of the Corporation prior to
the expiration of this Warrant and accompanied or preceded by the surrender of
this Warrant along with a check in payment of the Warrant Exercise Price for
such Warrant Shares.

                  (b) Except as provided in Section 7 hereof, this Warrant may
not be sold, transferred, assigned, hypothecated or divided into two or more
Warrants of smaller denominations, nor may any Warrant Shares issued pursuant to
exercise of this Warrant be transferred.

         2. EXCHANGE AND REPLACEMENT. Subject to Sections 1 and 7 hereof,
this Warrant is exchangeable upon the surrender hereof by the Holder to the
Corporation at its office for new Warrants of like tenor and date
representing in the aggregate the right to purchase the number of Warrant
Shares purchasable hereunder, each of such new Warrants to represent the
right to purchase such number of Warrant Shares (not to exceed the aggregate
total number purchasable hereunder) as shall be designated by the Holder at
the time of such surrender. Upon receipt by the Corporation of evidence
reasonably satisfactory to it of the loss, theft, destruction, or mutilation
of this Warrant, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to it, and upon surrender and cancellation
of this Warrant, if mutilated, the Corporation will make and deliver a new
Warrant of like tenor, in lieu of this Warrant. This Warrant shall be
promptly canceled by the Corporation upon the surrender hereof in connection
with any exchange or replacement. The Corporation shall pay all expenses,
taxes (other than stock transfer taxes), and other charges payable in
connection with the preparation, execution, and delivery of Warrants pursuant
to this Section 2.

         3. ISSUANCE OF THE WARRANT SHARES.

                  (a) The Corporation agrees that the Warrant Shares shall be
and are deemed to be issued to the Holder as of the close of business on the
date on which this Warrant shall have been surrendered and the payment made for
such Warrant Shares as aforesaid. Subject to the provisions of paragraph (b) of
this Section 3, certificates for the Warrant Shares so purchased shall be
delivered to the Holder within a reasonable time after the rights represented by
this Warrant shall have been so exercised, and, unless this Warrant has expired,
a new Warrant representing the right to purchase the number of Warrant Shares,
if any, with respect to which this Warrant shall not then have been exercised
shall also be delivered to the Holder.

                  (b) Notwithstanding the foregoing, however, the Corporation
shall not be required to deliver any certificate for Warrant Shares upon
exercise of this Warrant except in accordance with exemptions from the
applicable securities registration requirements or registrations under
applicable securities laws. Nothing herein shall obligate the Corporation to
effect registrations under federal or state securities laws. If registrations
are not in effect and if exemptions are not available when the Holder seeks to
exercise the Warrant, the Warrant

                                      -2-
<PAGE>

exercise period will be extended, if need be, to prevent the Warrant from
expiring, until such time as either registrations become effective or exemptions
are available, and the Warrant shall then remain exercisable for a period of at
least 30 calendar days from the date the Corporation delivers to the Holder
written notice of the availability of such registrations or exemptions. The
Holder agrees to execute such documents and make such representations,
warranties, and agreements as may be required solely to comply with the
exemptions relied upon by the Corporation, or the registrations made, for the
issuance of the Warrant Shares.

         4. COVENANTS OF THE CORPORATION. The Corporation covenants and
agrees that all Warrant Shares will, upon issuance, be duly authorized and
issued, fully paid, nonassessable and free from all taxes, liens and charges
with respect to the issue thereof. The Corporation further covenants and
agrees that during the period within which the rights represented by this
Warrant may be exercised, the Corporation will at all times have authorized
and reserved for the purpose of issue or transfer upon exercise of the
subscription rights evidenced by this Warrant a sufficient number of shares
of Common Stock to provide for the exercise of the rights represented by this
Warrant.

         5. ANTI-DILUTION ADJUSTMENTS. The provisions of this Warrant are
subject to adjustment as provided in this Section 5.

                  (a) The Warrant Exercise Price shall be adjusted from time to
time such that in case the Corporation shall hereafter:

                           (i) pay any dividends on any class of stock of the
         Corporation payable in Common Stock or securities convertible into
         Common Stock;

                           (ii) subdivide its then outstanding shares of Common
         Stock into a greater number of shares; or

                           (iii) combine outstanding shares of Common Stock, by
         reclassification or otherwise;

then, in any such event, the Warrant Exercise Price in effect immediately
prior to such event shall (until adjusted again pursuant hereto) be adjusted
immediately after such event to a price (calculated to the nearest full cent)
determined by dividing (A) the number of shares of Common Stock outstanding
immediately prior to such event, multiplied by the then existing Warrant
Exercise Price, by (B) the total number of shares of Common Stock outstanding
immediately after such event (including in each case the maximum number of
shares of Common Stock issuable in respect of any securities convertible into
Common Stock), and the resulting quotient shall be the adjusted Warrant
Exercise Price per share. An adjustment made pursuant to this Subsection
shall become effective immediately after the record date in the case of a
dividend or distribution and shall become effective immediately after the
effective date in the case of a subdivision, combination or reclassification.
If, as a result of an adjustment made pursuant to this Subsection, the Holder
of any Warrant thereafter surrendered for exercise shall become entitled to
receive shares of two or more classes of capital stock or shares of Common
Stock and

                                      -3-
<PAGE>

other capital stock of the Corporation, the Board of Directors (whose
determination shall be conclusive) shall determine the allocation of the
adjusted Warrant Exercise Price between or among shares of such classes of
capital stock or shares of Common Stock and other capital stock. All
calculations under this Subsection shall be made to the nearest cent or to
the nearest 1/100 of a share, as the case may be. In the event that at any
time as a result of an adjustment made pursuant to this Subsection, the
holder of any Warrant thereafter surrendered for exercise shall become
entitled to receive any shares of the Corporation other than shares of Common
Stock, thereafter the Warrant Exercise Price of such other shares so
receivable upon exercise of any Warrant shall be subject to adjustment from
time to time in a manner and on terms as nearly equivalent as practicable to
the provisions with respect to Common Stock contained in this Section

          (b)  Upon each adjustment of the Warrant Exercise Price pursuant to
Section 5(a) above, the Holder of each Warrant shall thereafter (until
another such adjustment) be entitled to purchase at the adjusted Warrant
Exercise Price the number of shares, calculated to the nearest full share,
obtained by multiplying the number of shares specified in such Warrant (as
adjusted as a result of all adjustments in the Warrant Exercise Price in
effect prior to such adjustment) by the Warrant Exercise Price in effect
prior to such adjustment and dividing the product so obtained by the adjusted
Warrant Exercise Price.

          (c)  In case of any consolidation or merger to which the
Corporation is a party other than a merger or consolidation in which the
Corporation is the continuing corporation, or in case of any sale or
conveyance to another corporation of the property of the Corporation as an
entirety or substantially as an entirety, or in the case of any statutory
exchange of securities with another corporation (including any exchange
effected in connection with a merger of a third corporation into the
Corporation), there shall be no adjustment under Subsection (a) of this
Section 5 but the Holder of each Warrant then outstanding shall have the
right thereafter to convert such Warrant into the kind and amount of shares
of stock and other securities and property which he would have owned or have
been entitled to receive immediately after such consolidation, merger,
statutory exchange, sale, or conveyance had such Warrant been converted
immediately prior to the effective date of such consolidation, merger,
statutory exchange, sale, or conveyance and, in any such case, if necessary,
appropriate adjustment shall be made in the application of the provisions set
forth in this Section with respect to the rights and interests thereafter of
any Holders of the Warrant, to the end that the provisions set forth in this
Section shall thereafter correspondingly be made applicable, as nearly as may
reasonably be, in relation to any shares of stock and other securities and
property thereafter deliverable on the exercise of the Warrant. The
provisions of this Subsection shall similarly apply to successive
consolidations, mergers, statutory exchanges, sales or conveyances.

          (d)   Upon any adjustment of the Warrant Exercise Price, then and
in each such case, the Corporation shall give written notice thereof, by
first-class mail, postage prepaid, addressed to the Holder as shown on the
books of the Corporation, which notice shall state the Warrant Exercise Price
resulting from such adjustment and the increase or decrease, if any, in the
number of shares of Common Stock purchasable at such price upon the exercise
of this Warrant,

                                 -4-
<PAGE>

setting forth in reasonable detail the method of calculation and the facts
upon which such calculation is based.

     6.  NO VOTING RIGHTS. This Warrant shall not entitle the Holder to any
voting rights or other rights as a shareholder of the Corporation.

                                 -5-
<PAGE>

     7.  NOTICE OF TRANSFER OF WARRANT OR RESALE OF THE WARRANT SHARES.

          (a)  Subject to the sale, assignment, hypothecation, or other
transfer restrictions set forth in Section 1 hereof, the Holder, by
acceptance hereof, agrees to give written notice to the Corporation before
transferring this Warrant or transferring any Warrant Shares of such Holder's
intention to do so, describing briefly the manner of any proposed transfer.
Promptly upon receiving such written notice, the Corporation shall present
copies thereof to the Corporation's counsel. If in the opinion of such
counsel the proposed transfer may be effected without registration or
qualification (under any federal or state securities laws), the Corporation,
as promptly as practicable, shall notify the Holder of such opinion,
whereupon the Holder shall be entitled to transfer this Warrant or to dispose
of Warrant Shares received upon the previous exercise of this Warrant, all in
accordance with the terms of the notice delivered by the Holder to the
Corporation; provided that an appropriate legend may be endorsed on this
Warrant or the certificates for such Warrant Shares respecting restrictions
upon transfer thereof necessary or advisable in the opinion of counsel and
satisfactory to the Corporation to prevent further transfers which would be
in violation of Section 5 of the 1933 Act and applicable state securities
laws; and provided further that the prospective transferee or purchaser shall
execute such documents and make such representations, warranties, and
agreements as may be required solely to comply with the exemptions relied
upon by the Corporation for the transfer or disposition of the Warrant or
Warrant Shares.

          (b)  If, in the opinion of the Corporation's counsel, the proposed
transfer or disposition of the Warrant or such Warrant Shares described in
the written notice given pursuant to this Section 7 may not be effected
without registration or qualification of this Warrant or such Warrant Shares,
the Corporation shall promptly give written notice thereof to the Holder, and
the Holder will limit its activities in respect to such transfer or
disposition as, in the opinion of such counsel, are permitted by law.

     8.  FRACTIONAL SHARES. Fractional shares shall not be issued upon the
exercise of this Warrant, but in any case where the holder would, except for
the provisions of this Section, be entitled under the terms hereof to receive
a fractional share, the Corporation shall, upon the exercise of this Warrant
for the largest number of whole shares then called for, pay a sum in cash
equal to the sum of (a) the excess, if any, of the Market Price of such
fractional share over the proportional part of the Warrant Exercise Price
represented by such fractional share, plus (b) the proportional part of the
Warrant Exercise Price represented by such fractional share. For purposes of
this Section, the term "Market Price" with respect to shares of Common Stock
of any class or series means the last reported sale price or, if none, the
average of the last reported closing bid and asked prices on any national or
regional securities exchange or quoted in the National Association of
Securities Dealers, Inc.'s Automated Quotations System ("Nasdaq"), or if not
listed on a national or regional securities exchange or quoted in Nasdaq, the
average of the last reported closing bid and asked prices as reported by
Metro Data Corporation, Inc. or the Electronic Bulletin Board of the National
Association of Securities Dealers, Inc. from quotations by market makers in
such Common Stock on the Minneapolis-St. Paul local over-the-counter market,
or if no quotations in such Common Stock are available, the fair market value
of the shares as determined in good faith by the Board of Directors of the
Corporation.

                                 -6-
<PAGE>

     9.  REGISTRATION RIGHTS.

         (a)  INCIDENTAL REGISTRATION.  If the Corporation at any time within
three (3) years from the date of this Warrant proposes to register under the
1933 Act any of its securities on Forms S-1, S-2, SB-2, S-3, or on any
successor or similar form of Registration Statement (EXCEPT with respect to
the first public offering of securities by the Corporation pursuant to a
registration statement filed under the 1933 Act after the date of this
Warrant), it will give written notice to all Holders of this Warrant, any
Warrants issued pursuant to Section 2 and/or Section 3(a) hereof, and any
Warrant Shares of its intention to do so, and on the written request of any
such Holder given within twenty (20) calendar days after receipt of any such
notice (which request shall specify the Warrant Shares intended to be sold or
disposed of by such Holder), the Corporation will use its best efforts to
cause all such Warrant Shares, the Holders of which shall have requested the
registration or qualification thereof, to be included in such registration
statement proposed to be filed by the Corporation; provided, however, that if
a greater number of Warrant Shares is offered for participation in the
proposed offering than in the reasonable opinion of the managing underwriter
of the proposed offering (which opinion shall be in writing and delivered to
the Holders) can be accommodated without adversely affecting the proposed
offering, then the amount of Warrant Shares proposed to be offered by such
Holders for registration, as well as the number of securities of any other
selling shareholders participating in the registration, shall not be included
or shall be proportionately reduced to a number deemed satisfactory by the
managing underwriter. With respect to each inclusion of securities in a
registration statement pursuant to this Section 9(a), the selling Holders
shall pay the fees and disbursements of special counsel and accountants for
the selling Holders, and underwriting discounts or commissions and transfer
taxes applicable to the selling Holders' shares, and the Corporation shall
pay all other costs and expenses of the registration, including but not
limited to all registration, filing and NASD fees, printing expenses, fees
and disbursements of counsel and accountants for the Corporation, all
internal expenses, and legal fees and disbursements and other expenses of
complying with state securities laws of any jurisdictions in which the
securities to be offered are to be registered or qualified. Holders who elect
to include their Warrants Shares in a registration pursuant to this Section
9(a) shall participate in the registered offering on the same terms as the
Corporation.

         (b)  DEMAND REGISTRATION.  Further, on a one-time basis only, during
the period commencing on the date of this Warrant and ending three (3) years
after the date of this Warrant, provided that the Corporation then is
eligible to use a Registration Statement on Form S-3 or any equivalent form
of short-form registration statement for the registration of the sale of the
Warrant Shares pursuant to the 1933 Act, upon request by the Holder or
Holders, the Corporation will promptly take all necessary steps to register
under the 1933 Act on Form S-3 or equivalent form of short-form registration
statement and under the securities laws of such states as the holders may
reasonably request, such number of Warrant Shares issued and to be issued
upon exercise of the Warrants requested by such Holders in their request to
the Corporation. After a demand for registration has been made by a Holder or
Holders of the requisite number of Warrants or Warrant Shares, the
Corporation will give written notice of the demand registration to all
Holders of Warrants or Warrant Shares and, on the written request of any such
Holder given within twenty (20) calendar days after receipt of any such
notice (which request shall specify the Warrant Shares

                                     -7-

<PAGE>

intended to be sold or disposed of by such Holder), the Corporation will
cause all such Warrant Shares, the Holders of which shall have requested the
registration or qualification thereof, to be included in such demand
registration statement. Notwithstanding anything in this Warrant to the
contrary, the Corporation shall not be obligated to register the Warrant
Shares under this Section 9(b) unless Holders who hold more than fifty
percent (50%) of the total number of Warrants issued as part of the Series of
Warrants and of any shares acquired upon exercise of such Warrants request
such registration. With respect to a demand registration statement pursuant
to this Section 9(b), the selling Holders shall pay the fees and
disbursements of special counsel and accountants for the selling Holders, and
underwriting discounts or commissions and transfer taxes applicable to the
selling Holders' shares, and the Corporation shall pay all other costs and
expenses of the registration, including but not limited to all registration,
filing and NASD fees, printing expenses, fees and disbursements of counsel
and accountants for the Corporation, all internal expenses, and legal fees
and disbursements and other expenses of complying with state securities laws
of any jurisdictions in which the securities to be offered are to be
registered or qualified. The Corporation shall keep effective and maintain
any registration, qualification, notification, or approval specified in this
Section 9(b) for such period as may be reasonably necessary for such Holder
or Holders of such Warrant Shares to dispose thereof and from time to time
shall amend or supplement the prospectus used in connection therewith to the
extent necessary in order to comply with applicable law. The Corporation need
not maintain the effectiveness of any such registration, qualification,
notification or approval, whether or not at the request of the Holders, more
than six (6) months following the effective date thereof.

         (c)  COOPERATION.  Upon the exercise of registration rights pursuant
hereto, each holder agrees to supply the Corporation with such information as
may be required by the Corporation to register or qualify the shares to be
registered.

    10.  REDEMPTION.  The Warrants may be redeemed by the Corporation, in
whole or in part, at a redemption price of $0.01 per Warrant (subject to
appropriate adjustment as determined by the Corporation's Board of Directors
in the event of the occurrence of the events described in Sections 5(a)(i),
(ii) and (iii)) upon notice of such redemption given by the Corporation not
less than thirty (30) days prior to the date fixed for redemption mailed to
the holders of Warrants at their last registered addresses. The Corporation
shall be entitled to redeem the Warrants as provided in this Section 10 only
if the closing bid price of the Common Stock exceeds $4.00 per share (subject
to appropriate adjustment as determined by the Corporation's Board of
Directors in the event of the occurrence of the events described in Sections
5(a)(i), (ii) and (iii)) for any ten (10) consecutive trading days prior to
such notice. If notice of redemption shall have been given to the Holders,
the exercise rights of the Warrants identified for redemption shall expire
at the close of business on such date of redemption, unless extended by the
Corporation.

                                     -8-

<PAGE>

     IN WITNESS WHEREOF, Vicom Incorporated has caused this Warrant to be
signed by its duly authorized officer and this Warrant to be dated
________________, 199_.

                                        Vicom Incorporated

                                        -------------------------------------
                                        Chief Executive Officer

                                     -9-

<PAGE>

   (To Be Executed by the Registered Holder in Order to Exercise the Warrant)

To:  Vicom Incorporated

The undersigned hereby irrevocably elects to exercise the attached Warrant to
purchase for cash, ____________ of the shares issuable upon the exercise of
such Warrant, and requests that certificates for such shares (together with a
new Warrant to purchase the number of shares, if any, with respect to which
this Warrant is not exercised) shall be issued in the name of:

                         NAME:
                                        -------------------------------------

                         SOC. SEC. or
                         TAX I.D. NO.
                                        -------------------------------------

                         ADDRESS:
                                        -------------------------------------

                                        -------------------------------------

Date:_________________, 19__.           -------------------------------------
                                        Signature *

*  The signature on the Notice of Exercise of Warrant must correspond to the
   name as written upon the face of the Warrant in every particular without
   alteration or enlargement or any change whatsoever. When signing on behalf
   of a corporation, partnership, trust or other entity, please indicate your
   position(s) and title(s) with such entity.

<PAGE>

                                ASSIGNMENT FORM

  (To be Executed by the Registered Holder in Order to Transfer the Warrant)

To:  Vicom Incorporated

     FOR VALUE RECEIVED, the undersigned hereby sells, assigns, and transfers
unto _________________________________ the right to purchase the securities
of Vicom Incorporated, Inc. to which the within Warrant relates and appoints
_______________________________, attorney, to transfer said right on the
books of Vicom, Incorporated with full power of substitution in the premises.

Dated:
      --------------------.                 ---------------------------------
                                            (Signature)

                                            Address:

                                            ---------------------------------

                                            ---------------------------------

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