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DEBUG "DEFine" Command...
DEFine <debugger-name> <string>
A <debugger-name> is an identifier preceded by an accent grave <`>.
A <string> is any legal debugger text. It is substituted
directly when the <debugger-name> is used.
Debugger names are also used for macros and debugger variables. To
create macros, see the Macro command. To create debugger variables,
see the Set command.