Each of the words
values is treated as a single
(possibly quoted) word in a shell command.
The first argument is the filename
(either a full pathname, or the name of a file on the current path)
of an executable file.
These values can be numeric, or strings, or something else, and
are converted automatically to string values.
exec("/home/mbt/bin/process_obj.py", OBJ_NAME)
exec("process_skycoords.py", RA, DEC)
exec("process_sphericalcoords.sh", RA, DEC, 1.0)