Be sure to secure your system when unattended. Inc. When hundreds or even thousands of computers are connected via networks, it can be a security nightmare, unless everyone understands and practices the right procedures. Other times it is more complicated, like implementing encryption standards which transform data into a form that is unreadable by anyone without a secret decryption key. If unauthorized users get their hands on an encrypted file, they can't do anything with it unless they have the password key. Encryption should be used whenever sensitive files are transferred or stored in an unsecured medium, like a common area of a network or over the Internet.
Printers are another weak link in the chain, especially networked printers in central locations.
Whenever you print out sensitive data, you need to ensure that the printout is secure. Go promptly to pick up ALL copies of the sent documents. And be sure to dispose of sensitive documents in an appropriate manner. Use a special sensitive trash receptacle or a paper shredder. Another area of concern is recycle bins or regular trash containers.