XPIPE for VMS

PIPE_WIDGETS.UID and PIPE_ICONS.UID files must be installed under CENA_X
directory. Idem for PIPE_HELP. file

You can modify this in COMPILE.COM file (but you need to recompile) if
you don't want to define CENA_X logical

Patrick Moreau   (pmoreau@ada.cenaath.cena.dgac.fr)