1 DEBUG
The VMS Symbolic Debugger provides an extensive interactive debugging
facility.  Capabilities include : 

        Full screen display of source, output, and commands
	Breakpoints
	Tracepoints
	Variable monitoring
	Subroutine monitoring
	Instruction stepping
	Instruction examination (source)
	Variable examination and deposit
	Expression evaluation
	Subroutine calling

The FORTRAN User's Guide contains an overview of Debugger usage with
FORTRAN programs.  Other language manuals contain similar sections. More
detailed information is available in the VAX-11 Symbolic Debugger
Reference Manual. 
