Control C Trap Handler for Fortran
		----------------------------------

	This package permits the PDP-11 Fortran user to intercept the
Control C character, and allows him/her to redirect program control
to a user-specified line number.  The package has been tested successfully
under the FOR, F4P, and F77 Fortran compilers.  If the FOR Fortran
compiler is used, threaded code (/CD:THR) should NOT be specified.

	To set up the Control C trap, the Fortran user executes
the following statement:

		IF (ITRAP()) GOTO xxx

	where	xxx is the line number to go to on Control C

The Control C trap will be cancelled under any of the following conditions:
	(1) The procedure calling ITRAP executes a RETURN
	(2) The trap is explicitly cancelled by a call to UNTRAP()
	(3) The trap is implicitly cancelled by a Control C trap