[Hampshire] Is my program detached?

I need to determine if my Linux program is running detached,
e.g. if it was launched by
vfxlin
or
vfxlin &

Is there a standard way for the vfxlin program to determine
this? It would also be useful to know if input or output is
being piped.

Stephen
--
Stephen Pelc, stephen@???
MicroProcessor Engineering Ltd - More Real, Less Time
133 Hill Lane, Southampton SO15 5AF, England
tel: +44 (0)23 8063 1441, fax: +44 (0)23 8033 9691
web: http://www.mpeforth.com - free VFX Forth downloads