These commands can be used to generate and clear a low level graphic structure. The low level image is the list of graphical primitives which can be displayed by simple graphic routines. Normally these commands are embedded to other commands such as wrps (see Sect. 8.3) or to the user interface.
... NDA> mkgrp grp1 -s s1 ... NDA> setimg grp1 ... NDA> rmimg grp1 ...