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The system environment variables contain among other things the ones listed below. A longer list can be found at http://kennethhunt.com/archives/000933.html.
CD
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%CD%
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current directory string.
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COMPUTERNAME
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%COMPUTERNAME%
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name of the computer.
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DATE
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%DATE%
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current date.
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ERRORLEVEL
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%ERRORLEVEL%
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error code of the most recently used command.
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HOMEPATH
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%HOMEPATH%
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path of user's home directory. .
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NUMBER_OF_PROCESSORS
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%NUMBER_OF_PROCESSORS%
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number of processors installed on the computer.
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OS
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%OS%
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OS name. Windows XP and Windows 2000 display as Windows_NT.
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PATH
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%PATH%
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System specifies the search path for executable files.
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TIME
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%TIME%
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current time
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Note of caution: The following standard environment variables are not always available:
CD
CMDCMDLINE
CMDEXTVERSION
DATE
ERRORLEVEL
PROMPT
RANDOM
TIME
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