getfrm returns the current frameID number. The frameID number is a number assigned to the frame by FMLI and displayed flush left in the frame's
title bar. If a frame is closed its frameID number may be reused when a new frame is opened. getfrm takes no arguments.
It is not a good idea to use getfrm in a backquoted expression coded on a line by itself. Stand-alone backquoted expressions are evaluated before any descriptors are parsed, thus
the frame is not yet fully current, and may not have been assigned a frameID number.
