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Many of the environment variables in the preceding example are ones that Windows Vista automatically sets with information about your system . You can use these values in batch programs, Doskey macros, and command lines and if you re a programmer, in the programs you write . The system-defined environment variables include the following:
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Information about your place in the network COMPUTERNAME contains the network name of your computer, USERDOMAIN contains the name of the domain you logged on to, and USERNAME contains your logon name . Information about your computer PROCESSOR_ARCHITECTURE contains the computer type of processor (such as x86 ), and PROCESSOR_IDENTIFIER, PROCESSOR_LEVEL, and PROCESSOR_REVISION provide specific information about the processor version . Information about Windows Vista SystemRoot contains the drive and folder in Vista which Windows Vista is installed; SystemDrive contains only the drive letter . Information about your programs When you type a program name (to start the programs program) without typing its path, Windows Vista looks first in the current folder . If the program isn t located in the current folder, Windows Vista looks in each folder listed in the Path variable . Information about the command prompt PROMPT contains codes that define prompt the appearance of the command prompt itself . (For details, type prompt / at the prompt .)
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Changes to environment variables made via Control Panel affect your next and subsequent Command Prompt sessions (not the current ones, of course). Changes made via Autoexec.bat are not effective until the next time you log on. In case of conflicting assignments, user variables take precedence over system variables, which take precedence over variables declared in Autoexec.bat. The Path variable, however, is cumulative. That is, changes made in any venue are appended to any changes made elsewhere. (But changes made via Autoexec.bat or HKCU\Environment are not effective until your next logon.) Within a given Command Prompt session, you can change environment variables by means of Set statements. Such statements affect only the current session and any applications (including additional Command Prompt sessions) spawned from the current session.
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Note
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The Autoexec .nt file has no effect on the Command Prompt environment . Autoexec .nt affects MS-DOS based applications only . Command Prompt, although it is the MS-DOS command interpreter, is itself a Windows Vista based application .
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Appendix B
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1046 Appendix B Working with the Command Prompt
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You can customize the appearance of a Command Prompt window in several ways. You can change its size, select a font, and even use eye-pleasing colors. And you can save these settings independently for each shortcut that launches a Command Prompt session, so that you can make appropriate settings for different tasks. To customize a Command Prompt window, you make settings in a properties dialog box that you can reach in any of three ways:
Right-click a shortcut that opens a Command Prompt window, and choose Properties from the shortcut menu. Changes you make here affect all future Command Prompt sessions launched from this shortcut. Click the Control menu icon in a Command Prompt window, and choose Properties from the Control menu. (If Command Prompt is running in full-screen mode, press Alt+Enter to switch to window display.) Changes you make here affect the current session. When you leave the properties dialog box, you ll be given the option of propagating your changes to the shortcut from which this session was launched. If you accept, all future sessions launched from that shortcut will have the new properties. Click the Control menu icon in a Command Prompt window, and choose Defaults from the Control menu. Changes here do not affect the current session. Instead, they affect all future sessions, except those launched from a shortcut whose properties you have modified. They also affect future sessions in character-mode, MSDOS based applications that do not have a program-information file (PIF) and do not store their own settings.
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