Click on the button to direct MMS to use the macro definition "DEBUG=1".

 Automatically generated description files will contain the following
 lines:

 .IFDEF DEBUG
 DBG = /DEBUG
 DBGOPT = /NOOPTIMIZE/DEBUG
 .ELSE
 DBG = /NODEBUG
 DBGOPT = /OPTIMIZE/NODEBUG
 .ENDIF

 and every compilation command will include the $(DBG) or the
 $(DBGOPT) macro.

 If this toggle button is clicked on, then every compilation in the build
 will be compiled with information to be included in the object module
 for use with the VAX Symbolic Debugger.  Also the linker will be directed
 to generate a debugger symbol table and to give the debugger control when
 the image is run.

 Users can use the same mechanism in their own hand-written description
 files.