ProXT preserves the original naming conventions used in the X
Toolkit except that the first letter of each name is converted to lower
case, since Prolog treats names beginning with an upper case letter as
variables. Thus all Xt functions start with the prefix
xt, and all Motif functions start with xm. Motif resource names
start with the prefix xmN.
There is a set of ProXT predicates that do not correspond directly
to functions from the underlying C interface. Such predicates start
with the prefix proxt.