$ CC FOOBAR
compiles FOOBAR.C to FOOBAR.OBJ.
$ FORTRAN FOOBAR
compiles FOOBAR.FOR to FOOBAR.OBJ.
$ LINK FOOBAR+GOODIES/LIBRARY
link FOOBAR.OBJ with GOODIES.OLB to FOOBAR.EXE.
$ RUN FOOBAR
runs FOOBAR.EXE with no arguments.
$ FOOBAR :== $disk:[dir]FOOBAR.EXE $ FOOBAR argument
runs FOOBAR.EXE with argument.