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DEBUG "Environment" Command...
ENVironment [ <routine-name> | -Run ]
If no options are given, this command displays the current.
program location, and the user environment, if different.
If a valid <routine-name> is given, the debugger uses it
as the assumed environment, (instead of the current program
location), for finding variables, line numbers, and arguments.
If the -Run option is given, the assumed environment is put back
to the current program location.