Patent Publication Number: US-2003223182-A1

Title: Information processing apparatus and window size control method used in the same unit

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001] This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2002-155436, filed May 29, 2002, the entire contents of which are incorporated herein by reference.  
       BACKGROUND OF THE INVENTION  
       [0002] 1. Field of the Invention  
       [0003] The present invention relates to an information processing apparatus such as a personal computer and a window size control method used in the same apparatus. More specifically, the invention relates to an information processing apparatus that is capable of displaying a plurality of windows on a display screen and a window size control method used in the same apparatus.  
       [0004] 2. Description of the Related Art  
       [0005] A multi-window system is generally adopted in an information processing apparatus such as a personal computer. The multi-window system is a window environment that is capable of displaying a plurality of windows, which correspond to various programs such as applications and utilities, on a display screen.  
       [0006] The multi-window system is usually provided with a graphical user interface for controlling each of the windows. As one graphical user interface, a menu and a button icon for resizing the window are arranged on each window. A user selects a command for resizing from the menu by using a mouse or clicks the button icon by using the mouse, to switch the size of the window to one of normal size, full screen size and minimum size.  
       [0007] A shortcut key function for switching the size of an active window through a keyboard is also known. Using the shortcut key function, a user can resize the active window immediately without performing an operation for selecting a command for resizing or an operation for clicking a button icon.  
       [0008] In the shortcut key function, however, a shortcut key is a combination of an auxiliary key including one or more keys such as “Ctrl” and “Alt” keys and another key such as an alphabetic key. It is thus necessary to depress a plurality of keys at once in order to use a shortcut key function.  
       [0009] Moreover, a combination of keys for a shortcut key function varies with a target window size. In other words, a target window size is explicitly designated by a combination of input keys for a shortcut key function. For this reason, a user cannot switch a window size to a desired one unless he or she remembers a plurality of combinations of keys corresponding to their respective window sizes (normal size, full screen size and minimum size).  
       [0010] It is thus desired to be able to achieve a mechanism for switching a window size through a simpler operation than using a shortcut key.  
       BRIEF SUMMARY OF THE INVENTION  
       [0011] According to an embodiment of the present invention, there is provided an information processing apparatus that is capable of displaying a plurality of windows on a display screen, comprising means for generating a button event in response to an operation of a given button, means for detecting a current window size of an active window upon generation of the button event, and means for switching the current window size of the active window to a window size which differs from the detected current window size. 
     
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING  
     [0012] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.  
     [0013]FIG. 1 is a front view showing an outward appearance of a computer according to an embodiment of the present invention;  
     [0014]FIG. 2 is a block diagram of a system configuration of the computer shown in FIG. 1;  
     [0015]FIG. 3 is a diagram showing an example of an arrangement of buttons provided on a remote control unit that allows communications with the computer of FIG. 1;  
     [0016]FIG. 4 is a diagram showing an example of the order in which a window size of the computer of FIG. 1 is switched;  
     [0017]FIG. 5 is a diagram showing another example of the order in which a window size of the computer of FIG. 1 is switched;  
     [0018]FIG. 6 is a block diagram showing an example of a process from when a button is depressed in the computer of FIG. 1 until when the window size thereof is switched;  
     [0019]FIG. 7 is a flowchart showing an example of a procedure of a window size switching process performed by window size switching programs used in the computer of FIG. 1;  
     [0020]FIG. 8 is a diagram of an active window whose window size is switched through the window size switching process shown in FIG. 7;  
     [0021]FIG. 9 is a block diagram showing another example of a process performed from when a button is depressed in the computer of FIG. 1 until when the window size thereof is switched;  
     [0022]FIG. 10 is a flowchart showing another example of the window size switching process performed by the window size switching programs used in the computer of FIG. 1;  
     [0023]FIG. 11 is a view showing an example of a window size selection screen used in the window size switching process of FIG. 7; and  
     [0024]FIG. 12 is a view showing another example of the window size selection screen used in the window size switching process of FIG. 7. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
     [0025] An embodiment of the present invention will now be described with reference to the accompanying drawings. Referring to FIGS. 1 and 2, a configuration of an information processing apparatus according to the embodiment will be described first. The information processing apparatus is implemented as a notebook type personal computer.  
     [0026]FIG. 1 is a front view of the present computer whose display unit is opened. The computer includes a computer body  11  and a display unit  12 . The display unit  12  incorporates a display device  121  that is composed of an LCD (liquid crystal display). The display device  121  is located in substantially the central part of the display unit  12 .  
     [0027] The display unit  12  is attached to the computer body  11  such that it can freely turn between an open position and a close position. The computer body  11  is shaped like a thin box-type housing. The computer body  11  has a keyboard  111 , a touch pad  112  and right and left touch pad buttons  113   a  and  113   b  on its top.  
     [0028] The computer body  11  also has a power button  114  and two accessory buttons  115  and  116  on its rear top. The power button  114  is an externally input button that is formed of hardware and used as an operation button for turning on/off the computer. The two accessory buttons  115  and  116  are each an externally input button that is made of hardware. The accessory button  115  can be assigned an application program such as an Internet browser. When the accessory button  115  is depressed, the application program is started.  
     [0029] The accessory button  116  is assigned a function for switching a size of each of windows displayed on the display screen of the display device  121 . Whenever the accessory button  116  is depressed once, the window size of the currently active window (active window) is automatically switched to a different window size.  
     [0030] More specifically, each window is displayed in one of normal size, full screen size and minimum size. Whenever the accessory button  116  is depressed once, the window size of the active window is switched to normal size, full screen size, minimum size, normal size, full screen size, . . . in the order designated.  
     [0031] Furthermore, whenever the accessory button  116  is depressed once, the window size of the active window can alternately be toggled between the normal size and full screen size.  
     [0032] Hereinafter, the accessory button  116  is referred to as a full screen button.  
     [0033] The computer body  11  also has a communication port  117  on its front to perform communications with an external remote control unit  21 . The communication port  117  is a transmit/receive device that performs data communications with an external device by, e.g., infrared rays. Hereinafter, the communication port  117  is referred to as an IR port.  
     [0034] The remote control unit  21  is an external device that remotely controls the operation of the present computer. The remote control unit  21  has a plurality of remote control buttons on its top. The remote control buttons include a full screen button  22 . Like the full screen button  116  on the computer body  11 , the full screen button  22  serves as an operation button to switch the window size of the active window to a different window size.  
     [0035] More specifically, whenever the full screen button  22  is depressed once, the size of the active window is switched to normal size, full screen size, minimum size, normal size, full screen size, . . . in the order designated. Furthermore, whenever the full screen button  22  is depressed once, the size of the active window can alternately be toggled between normal size and full screen size.  
     [0036] A user can resize the active window by performing a simple operation of the full screen button  22  in a remote place from the computer using the remote control unit  21 .  
     [0037]FIG. 2 shows a system configuration of the present personal computer. As shown in FIG. 2, the computer includes a CPU  201 , a host bridge  202 , a main memory  203 , a graphics controller  204 , a communication device  205 , a PCI-ISA bridge  206 , an I/O controller  207 , a hard disk drive (HDD)  208 , a CD/DVD drive  209 , a BIOS-ROM  210 , an embedded controller/keyboard controller IC (EC/KBC)  211 , an infrared controller (IR controller)  213  and a power controller  214 .  
     [0038] The CPU  201  is a processor provided to control the operation of the computer. The CPU  201  executes the operating system (OS) and application programs/utility programs which are loaded into the main memory  203  from the hard disk drive (HDD)  208 . The CPU  201  also executes the BIOS (basic input output system) stored in the BIOS-ROM  210 . The control of window size using the full screen button  22  or  116  is performed by a dedicated utility program.  
     [0039] The host bridge  202  is a bridge device that connects a local bus of the CPU  201  and a PCI bus  1  bidirectionally. The graphics controller  204  controls the LCD  121  serving as a display monitor of the present computer. The communication device  205  is one of PCI devices and used to communicate with a computer network such as the Internet. The I/O controller  207  is one of the PCI devices and includes an IDE (integrated drive electronics) controller which controls the hard disk drive (HDD)  208  and CD/DVD drive  209 .  
     [0040] The PCI-ISA bridge  206  is a bridge device that connects the PCI bus  1  and ISA bus  2  bidirectionally and includes various system devices such as a system timer, a DMA controller and an interrupt controller. The BIOS-ROM  210  stores a BIOS. The BIOS is a program to control the hardware components in the system.  
     [0041] The BIOS includes a button event processing routine. The button event processing routine is to process a button event that occurs when a user depresses the full screen button  22  or  116 .  
     [0042] The embedded controller/keyboard controller IC (EC/KBC)  211  is a one-chip microcomputer in which an embedded controller for controlling power and a keyboard controller for controlling the keyboard  111  are integrated.  
     [0043] The EC/KBC  211  has a function of powering on/powering off the computer in association with the power controller  214  in response to a user&#39;s depression of the power button  114 . When a user depresses the full screen button  22  or  116 , the EC/KBC  211  generates a button event that represents the depression. The CPU  201  is notified of the button event in response to a hardware interrupt signal issued from EC/KBC  211  and thus executes the button event processing routine of the BIOS.  
     [0044] The IR controller  213  is a communication device that performs data communications with an external device by infrared rays. When the IR controller  213  receives a signal from the remote control unit  21  via the IR port  117 , the EC/KBC  211  generates the above button event.  
     [0045]FIG. 3 shows an example of an arrangement of buttons on the remote control unit  21 .  
     [0046] For example, the remote control unit  21  is shaped like a card-type thin housing and has, on its top, a power button  23 , cursor buttons  24 ,  25 ,  26  and  27 , an enter button  28  and a tab button  29 , as shown in FIG. 3, in addition to the above-described full screen button  22 . The remote control unit  21  also has an IR port  30  for infrared communications at one end.  
     [0047] The power button  23  is a button to designate the power-on/power-off of the computer. The cursor buttons  24 ,  25 ,  26  and  27  correspond to a plurality of cursor keys on the key board  111 , i.e., “←,” “←,” “→,” and “↓” keys, respectively. The enter button  28  and tub button  29  correspond to the “Enter” key and “Tab” key, respectively.  
     [0048] Even though any button is depressed, the remote control unit  21  transmits a signal (remote control code) corresponding to the depressed button to the computer by infrared rays.  
     [0049] A window size switching process, which is performed by a depression of the full screen button  22  or  116 , will now be described with reference to FIGS. 4 and 5.  
     [0050]FIG. 4 shows an example in which the size of the active window is switched to normal size, full screen size, minimum size, and normal size in the order designated whenever the full screen button  22  or  116  is depressed once.  
     [0051] The active window means a currently focused one of windows on the display screen or a window in which a cursor can be moved and to which a command and a text can be input.  
     [0052] If the full screen button  22  or  116  is depressed once when the active window is displayed in the normal size, the window size of the active window is switched from the normal size to the full screen size.  
     [0053] If the full screen button  22  or  116  is depressed once again, the window size of the active window is switched from the full screen size to the minimum size. If the full screen button  22  or  116  is depressed once again, the window size of the active window is switched from the minimum size to the normal size.  
     [0054]FIG. 5 shows an example in which the size of the active window is alternately switched between normal size and full screen size whenever the full screen button  22  or  116  is depressed once.  
     [0055] If the full screen button  22  or  116  is depressed once when the active window is displayed in the normal size, the window size of the active window is switched from the normal size to the full screen size. If the full screen button  22  or  116  is depressed once again, the window size of the active window is returned to the normal size.  
     [0056] The principle of the window size switching process in the above embodiment will now be described with reference to FIG. 6.  
     [0057] The respective windows on the display screen are controlled by an operating system (OS)  303 . The operating system  303  supports a multi-window environment and has a window size switching function using a shortcut key. In this function, the window size of the active window is resized to that designated by an input shortcut key. For example, there are three shortcut keys shown below to input a command for designating a window size.  
     [0058] (1) [Alt]+[Space]+[X]: shortcut keys that correspond to a command for designating a full screen size.  
     [0059] (2) [Alt]+[Space]+[N]: shortcut keys that correspond to a command for designating a minimum size.  
     [0060] (3) [Alt]+[Space]+[R]: shortcut keys that correspond to a command for returning the window size to the original size.  
     [0061] The operating system  303  includes an API (application programming interface) for using the window size switching function of the operating system  303  in the application programs.  
     [0062] In the present embodiment, the window size switching is realized by use of the API. In other words, the button event that indicates a depression of the full screen button  22  or  116  is emulated by a command (corresponding to a certain shortcut key) for causing the operating system  303  to execute a procedure for the window size switching process, and the command is transmitted to the operating system  303 . This emulation is performed by a window size switching program  302 .  
     [0063] The window size switching program  302  is a utility program exclusively for performing a window size switching process in response to the button event that indicates a depression of the full screen button  22  or  116 . The program  302  is implemented as a TSR (terminate-and-stay-resident) program. During the operation of the operating system  303 , the program  302  is always present on the main memory  203 .  
     [0064] Hereinafter an operation from when the full screen button  22  on the remote control unit  21  is depressed until the window size is switched will be described.  
     [0065] (1): Depression of Button  
     [0066] When a user depresses the full screen button  22  on the remote control unit  21 , the remote control unit  21  transmits a signal indicative of the depression of the full screen button  22  to the computer by infrared rays. This signal contains code data corresponding to the full screen button  22 . The signal transmitted from the remote control unit  21  is sent to the IR controller  213  through the IR port  117 .  
     [0067] (2) and (3): Generation of Button Event  
     [0068] When the IR controller  213  receives the signal, the EC/KBC  211  generates a button event indicative of the depression of the full screen button  22 . The generation of the button event is informed to the CPU  201  by an interrupt signal issued from the EC/KBC  211 .  
     [0069] The CPU  201  therefore executes the button event processing routine of the BIOS  301 .  
     [0070] In the button event processing routine of the BIOS  301 , a factor of generation of the button event from the EC/KBC  211  is checked. This checking is performed by a value of a status register in the EC/KBC  211 . The status register stores code data corresponding to the depressed button. If the button event generation factor is due to the depression of the full screen button  22 , the button event processing routine of the BIOS  301  notifies the window size-switching program  302  of the generation of the button event indicating that the full screen button  22  is depressed.  
     [0071] As described above, both a process of generating the button event indicating that the full screen button  22  is depressed and that of notifying the window size switching program  302  of the generation of the button event are performed through collaboration between the EC/KBC  211  and BIOS  301 .  
     [0072] (4), (5) and (6): Detection and Switching of Window Size  
     [0073] The window size switching program  302  performs both a process of detecting the current window size of the active window and that of switching the current window size of the active window to a window size different from the detected current window size each time it receives notification of generation of a button event. In other words, upon receiving notification of generation of a button event, the window size switching program  302  first issues a command, which requires a current window size of the active window, to the operating system  303  and thus acquires the current window size of the active window from the operating system  303  ((4) and (5)). Therefore, the window size-switching program  302  can detect the current window size of the active window.  
     [0074] After that, the window size switching program  302  determines a different target window size based on the detected current window size. The target window size is determined by both the predetermined order in which the window size is switched and the detected current window size.  
     [0075] The window size switching program  302  transmits a message, which designates the determined target window size, to the operating system  303  and thus instructs the operating system  303  to switch the window size of the active window (6). Accordingly, the operating system  303  performs the window size switching process (7).  
     [0076] The message is used to cause the operating system  303  to perform the same window size switching function as that performed when a shortcut key for designating the determined target window size is input. The message is implemented using the foregoing API. The message includes parameter indicative of the determined target window size. The operating system  303  resizes the active window to the window size designated by the parameter included in the message from the window size switching program  302 .  
     [0077] As described above, according to the present embodiment, both the process of detecting the current window size of the active window and that of switching the current window size to a different window size are performed each time the full screen button  116  or  22  is depressed. Since the window size of the active window can be switched to a different window size each time a user depresses the button  116  or  22 , the user can easily switch the window size only by a single button without remembering a plurality of combinations of keys corresponding to their respective window sizes.  
     [0078] A procedure executed by the window size switching program  302  will now be described specifically with reference to the flowchart shown in FIG. 7. Assume here that the window size is switched to the normal size, full screen size and minimum size in the order designated.  
     [0079] The window size switching program  302  performs the following process each time it is notified that a button event is generated by depressing the full screen button  22  (YES in step S 101 ).  
     [0080] The window size switching program  302  acquires the current window size of the active window from the operating system  303  (steps S 102  and S 103 ). Then, the program  302  determines whether the current window size is the normal size (step S 104 ). If the current window size is the normal size (YES in step S 104 ), the program  302  determines the full screen size as a target window size and instructs the operating system  303  to switch the current window size to the full screen size (step S 105 ). In step S 105 , a message including the parameter indicating the full screen size is sent to the operating system  303 . Thus, the window size of the active window is switched to the full screen size.  
     [0081] If the current window size of the active window is not the normal size, the window size switching program  302  determines whether the current window size is the full screen size or not (step S 106 ). If the current window size is the full screen size (YES in step S 106 ), the program  302  determines the minimum size as a target window size and instructs the operating system  303  to switch the current window size to the minimum size (step S 107 ). In step S 107 , a message including the parameter indicating the minimum size is sent to the operating system  303 . Thus, the window size of the active window is switched to the minimum size.  
     [0082] If the current window size is neither the normal size nor the full screen size or if the current window size is the minimum size (NO in step S 106 ), the window size switching program  302  determines the normal size as a target window size and instructs the operating system  303  to switch the current window size of the active window to the normal size (step S 108 ). In step S 107 , a message including the parameter indicating the normal size is sent to the operating system  303 . Thus, the window size of the active window is switched to the normal size.  
     [0083]FIG. 8 shows the active window whose window size is switched.  
     [0084] A desktop screen  400  serves as an on-screen work area. The windows corresponding to respective programs are set on the desktop screen  400 . An application window (#1)  401  is set on the desktop screen  400  and used as a currently focused active window.  
     [0085] The current window size of the application window (#1)  401  is the normal size. If the full screen button  22  is depressed once in this state, the window size of the application window (#1)  401  is switched to the full screen size. If the full screen button  22  is depressed once again, the window size of the application window (#1)  401  is switched to the minimum size.  
     [0086] If the system environment allows the application window (#1)  401  to continue serving as an active window even though the window size is switched to the minimum size, the window size of the application window (#1)  401  is switched to the normal size from the minimum size, when the full screen button  22  is depressed once again.  
     [0087] The window size need not be switched to the normal size, full screen size, minimum size and normal size in the order designated, but can be done in whatever order.  
     [0088] Instead of transmitting a message for explicitly designating the normal size as a target window size, a message indicating that the window size is returned to the original can be transmitted. This message is used to cause the operating system  303  to perform the same process as that performed when a shortcut key of (Alt+Space+R) is input.  
     [0089] A second example of the window size switching process in the above embodiment will now be described with reference to FIGS.  9  to  12 .  
     [0090] In the second example, when the full screen button  22  is depressed once, a window size selecting dialogue  501  is displayed on the display screen. The dialogue  501  is a window size selecting screen for selecting a target window size. A list of window sizes to be selected is displayed on the window size selecting dialogue  501 . The target window size is switched from the currently selected window size to another window size whenever the full screen button  22  is depressed.  
     [0091] Prior to the description of the procedure for the window size switching process using the window size selecting dialogue  501 , an example of the dialogue  501  will be described first.  
     [0092]FIG. 11 shows a first example of the window size selecting dialogue  501 . A window size list is displayed on the dialogue  501  and includes three icons  502 ,  503  and  504  corresponding to “full screen size,” “normal size,” and “minimum size”.  
     [0093] Letters “L,” “M” and “S” are put on the three icons  502 ,  503  and  504 , respectively. A selection frame  601  is displayed on the icon corresponding to a window size that is currently selected as a target one. The selection frame  601  is identification information for identifying a window size that is currently selected as a target one. If the “normal size” is selected as a target window size, the selection frame  601  is displayed on the icon (M)  503 . The display position of the selection frame  601  is moved to icon L, icon M, icon S, icon L, . . . in the order designated whenever the full screen button  22  is depressed once.  
     [0094] Furthermore, the window size selecting dialogue  501  includes a message display box  602 . A message to show a window size corresponding to the icon currently selected by the selection frame  601  is displayed in the message display box  602 .  
     [0095]FIG. 12 shows a second example of the window size selecting dialogue  501 . The dialogue  501  includes three bars  701 ,  702  and  703  corresponding to “full screen size,” “normal size,” and “minimum size”, in place of the icons  502 ,  503  and  504 . A message to show a window size corresponding to the bar is displayed on each of the bars. The message corresponding to the window size that is currently selected as a target one is highlighted. The highlight is moved to each of the bars whenever the full screen button  22  is depressed once.  
     [0096] The window size switching process using the window size selecting dialogue  501  will now be described with reference to FIG. 9.  
     [0097] Following is an operation from when the full screen button  22  on the remote control unit  21  is depressed until the window size switching process is performed.  
     [0098] (1) Depression of Button  
     [0099] When a user depresses the full screen button  22  on the remote control unit  21 , the remote control unit  21  transmits a signal indicative of the depression to the computer by infrared rays. This signal contains code data corresponding to the full screen button  22 . The signal transmitted from the remote control unit  21  is sent to the IR controller  213  through the IR port  117 .  
     [0100] (2) and (3) Generation of Button Event  
     [0101] In response to the reception of a signal by the IR controller  213 , the EC/KBC  211  generates a button event indicative of the depression of the full screen button  22 . The BIOS  301  is notified of the generation of the button event in response to an interrupt signal to the CPU  201 , thereby executing the button event processing routine of the BIOS  301 .  
     [0102] In the button event processing routine of the BIOS  301 , a factor of generation of the button event from the EC/KBC  211  is checked. This is performed by checking, for example, a value of a status register in the EC/KBC  21 . The status register stores code data indicating the depressed button. If the button event generation factor is due to the depression of the full screen button  22 , the window size switching program  302  is notified of the generation of the button event indicating that the full screen button  22  is depressed in the button event processing routine of the BIOS  301 .  
     [0103] (4) and (5) Detection of Window Size  
     [0104] Upon receiving notification of generation of a button event, the window size switching program  302  first issues a command, which requires a current window size of the active window, to the operating system  303  and thus acquires the current window size from the operating system  303 . The current window size of the active window is therefore detected. Then, the window size-switching program  302  determines a candidate for a target window size different from the current window size based on the detected current window size. The candidate is determined by both the predetermined order in which the window size is switched and the detected current window size.  
     [0105] (6) Display of Window Size Selecting Dialogue  
     [0106] The window size switching program  302  displays the window size selecting dialogue  501 , as shown in FIG. 11, on the display screen. In this case, the selection frame  601  is put on one of the three icons  502 ,  503  and  504 , which corresponds to the window size currently selected as a candidate for a target window size.  
     [0107] (7) Change of Candidate for Target Window Size  
     [0108] The window size switching program  302  stands by for a specific period of time (e.g., two seconds) after the window size selecting dialogue  501  is displayed and monitors whether a new button event is generated within the time period. If a user depresses the full screen button  22  again, the window size switching program  302  is notified of the generation of the button event by the above-described processes (1) to (3). In this case, the window size switching program  302  moves the selection frame  601  displayed on the window size selecting dialogue  501  one time. In other words, the window size of a target candidate is changed.  
     [0109] (8) Change of Window Size  
     [0110] If a specific time (e.g., two seconds) elapses after the selection frame  601  is moved, the window size switching program  302  determines a window size corresponding to the icon on which the selection frame  601  is currently put as a target window size. Then, the program  302  transmits a message, which indicates the switching to the determined target window size, to the operating system  303  and causes the system  303  to perform the window size switching process. This message is used to cause the operating system  303  to perform the same window size switching process as that performed when a shortcut key for designating the determined target window size is input. The operating system  303  switches the window size of the active window to the target window size designated by the message (9).  
     [0111] A procedure executed by the window size switching program  302  will now be described specifically with reference to the flowchart shown in FIG. 10.  
     [0112] The window size switching program  302  performs the following process when notification of generation of a button event is issued by depressing the full screen button  22  with no display of the window size selecting dialog  501  (YES in step S 201 ).  
     [0113] The window size switching program  302  acquires the current window size of the active window from the operating system  303  (steps S 202  and S 203 ). Then, the program  302  determines a candidate for a target window size and displays the window size selecting dialog  501  (step S 204 ). The selection frame  601  is put on the icon corresponding to the window size that is currently selected as the target candidate.  
     [0114] If a button event is generated again within two seconds of step S 204  (YES in step S 205 ), the window size switching program  302  moves the selection frame  601 , which is displayed on the window size selecting dialog  501 , one time to change the target candidate (step S 206 ). Then, the program  302  returns to step S 205  and monitors whether a button even is generated or not for two seconds. If no button event is generated within two seconds (NO in step S 205 ), the program  302  determines a window size corresponding to the icon selected by the selection frame  601  as a target one and instructs the operating system  303  to switch the window size of the active window to the determined target window size (step S 207 ). At this point in time, the window size selecting dialog  501  disappears from the display screen.  
     [0115] In step S 207 , the operating system  303  receives a message including parameter indicative of a target window size. Thus, the window size of the active window is switched to a window size corresponding to the icon selected by the selection frame  601 .  
     [0116] The foregoing embodiment has been described with a particular emphasis on the case where the full screen button  22  on the remote control unit  21  is depressed. The same process is performed even when the full screen button  116  on the computer body  11  is depressed. The means for communications between the remote control unit  21  and the computer is not limited to infrared rays, but the communications can be performed using a radio signal (RF) or the like. Furthermore, the remote control unit  21  and the computer can be connected by wire.  
     [0117] Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.