If Command Extensions are enabled, then there are several dynamic environment variables that can be expanded but which don't ...

Windows Server 2008

If Command Extensions are enabled, then there are several dynamic environment variables that can be expanded but which don't show up in the list of variables displayed by SET.  These variable values are computed dynamically each time the value of the variable is expanded. If the user explicitly defines a variable with one of these names, then that definition will override the dynamic one described below:  %%CD%% - expands to the current directory string.  %%DATE%% - expands to current date using same format as DATE command.  %%TIME%% - expands to current time using same format as TIME command.  %%RANDOM%% - expands to a random decimal number between 0 and 32767.  %%ERRORLEVEL%% - expands to the current ERRORLEVEL value  %%CMDEXTVERSION%% - expands to the current Command Processor Extensions     version number.  %%CMDCMDLINE%% - expands to the original command line that invoked the     Command Processor.

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