Using the standalone VAX DDT:
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	The first two files that need to be linked into your program are
scb.o and crtddt.o in that order.

	There is an external variable called 'noddt' which, if set, causes
DDT to start up you program immediately instead of starting in the DDT command
parser.

	First link your program together with fst.o at the end.  Now produce
the symbol table by:
	nm -gn a.out | mksymt > sym.s
	cc -c sym.s

	Now link your program again with the last two files being
'isymt.o st.o' instead of 'fst.o'.  'isymt.o' defines such symbols as
the registers.  It is only necessary to make a new symbol table if
there are new symbols or if symbols have been deleted.