OSDASET - DOS SETTINGS AND DESCRIPTIONS FOR AN OS/2 DESKTOP ICON 02/01/96 ======================================================================= DOS Settings and Descriptions for an OS/2 Desktop Icon ======================================================================= Please Read Entire Document for Full Explanation of Procedures -------------------------------------------------------------- **** NOTE: THIS IS AN EXTREMELY LARGE DOCUMENT **** DESCRIPTION This document contains the standard DOS settings in an OS/2 Virtual DOS Machine (VDM). Depending on hardware configuration, and software level, some of these settings might not exist. RESOLUTION AUDIO_ADAPTER_SHARING Function: Allows access to audio hardware for the DOS session. Two applications cannot use an audio adapter even if one is not required to run the program. This will allow you to minimize conflicts by defining audio specifications for each DOS session. Select Optional to indicate that a program in this DOS session should use an audio adapter if one is available. Select Required to indicate that a program in this DOS session must have access to an audio adapter. Select None to indicate that a program in this DOS session does not require an audio adapter. Default: None. Settable: At any time. COM_DIRECT_ACCESS Function: When set on, VCOM.SYS allows direct access to the COM ports. Advantages: Programs that need direct access, such as AS/400 Asynch Router, FastLynx, FSDUAT, and MS Word will now work. Drawbacks: Buffers in COM.SYS cannot be used. Characters might be lost, and some applications might suffer from the lack of buffering. Default: Off. Settable: At VDM creation only. COM_HOLD Function: When set on, provides exclusive access to COM ports for the specified VDM, preventing other processes from using the port and preventing the operating system from releasing the port until the VDM terminates. Advantages: For certain applications that use COM ports and require multiple programs to access the COM port (for example, this setting prevents the COM port from being released when the first program ends). Drawbacks: If not required by the application running in a VDM, this setting might prevent their applications from accessing COM ports. Default: Off. Settable: At VDM creation only. Examples: Certain bulletin board applications use one program to dial the BBS and another to exchange information; setting COM_HOLD to on prevents the operating system from releasing the COM port when the first program ends. COM_RECEIVE_BUFFER_FLUSH Function: Allows control of the received data buffers when the DOS session is switched to the foreground, or when the DOS program enables the received data interrupt. Select Receive Data Interrupt Enable to indicate that, for this DOS session, the operating system is to discard data in the received data buffer when the DOS program enables the received data interrupt. Select Switch to Foreground to indicate, for this DOS session, the operating system is to discard data in the received data buffer when the DOS program is switched to the foreground. Select ALL to indicate that communications data is to be discarded when a DOS program enables the received data interrupt or the program is switched to the foreground. Select NONE to indicate, for this DOS session, the operating system is to keep data in the received data buffer. Default: None. Settable: At VDM creation only. COM_SELECT Function: When set, allows a program to select and use one communication port. Advantages: You can limit your program to just the COM port that it requires; some programs, such as like LapLink Pro, try to take over every available COM port. Communications that are not selected are hidden from the program. Drawbacks: Some programs need to have access to the COM ports to work, even if they are not using them. Default: All (Full access to the COM ports.) Settable: At VDM creation only. DOS_AUTOEXEC Function: To specify a different batch file other than the default AUTOEXEC.BAT. Advantages: Different batch files could be specified for different DOS programs. Default: AUTOEXEC.BAT in root directory. Example: A new batch file that contains some SET statements relative to an individual program, can be kept separately. Settable: At VDM creation only. DOS_BACKGROUND_EXECUTION Function: When set off, suspends execution of the program when it is in the background. Advantages: Many DOS applications are written on the assumption that they are single-tasking and all the resources of the work station can be monopolized. It is not uncommon for a program to continually poll for keyboard input (examples are WordPerfect 5.1 and Lotus 1-2-3 R2.2). In a multitasking environment, this can impact system performance, especially when more than one such program is running. Turning the DOS application off when its VDM is in the background reduces its demands on the system. See also IDLE_SENSITIVITY and IDLE_SECONDS. 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