Description of CALLTREE follows. You can extract this text for insertion in
your system help file.
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1 CALLTREE
This program produces a flow chart of subroutine and function calls
for a FORTRAN program. It operates off the listing files generated by
the FORTRAN compiler. Prior to running the program, you should compile
all routines with (at minimum) the FORT/LIST/CROSS command. CALLTREE will
prompt for file names; you can enter the names in any order - the extension
".LIS" is automatically appended if not specified. At least one file MUST
contain the main program identified in a PROGRAM statement. The output
from CALLTREE looks like this:

Call tree for program MAIN
  2....SUB1 <file1.lis>
  3........SUBSUB2 <file2.lis>
  2....SUB2 <file1.lis>
  2....SUB3 <file3.lis>
  3........SUBSUB4 <file3.lis>
	etc., where each level of indentation implies a lower level of
	subroutine call.
Following that there will be a section listing each file and the names of
the routines contained in it. If the filename is "<System?>" then that is
an unresolved reference (or possibly a system or library call).
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If the output format of the FORTRAN compiler is ever changed, this program
will have to be modified. We are running FORTRAN V3.5-62 under VMS 3.7.

This program will get exceedingly confused if there are any recursive calls
in the FORTRAN programs you are cross-referencing. Even the situation where
subprogram A calls another subroutine B which calls C, and C also calls B,
but B is clever enough not to call C in that circumstance, will cause CALLTREE
to bomb or loop endlessly.

Questions and comments should be directed to:

		Mike Shefler
		Consad Research Corp.
		121 N. Highland Ave.
		Pittsburgh, PA  15206
		(412) 363-5500