                  A-CTRL & B-CTRL BUTTONS

In the right-hand sidepanel there are three buttons:  CLEAR,
A-CTRL  and  B-CTRL.   The button CLEAR is used to clear the
panel.  The other two  are  used  when  two  BPL  files  are
simultaneously  displayed  and each has more than one member
(more than one frame).  Given that one  BPL  file  has  been
loaded into the Model A channel and another into the Model B
channel,  enabling  their  simultaneous   viewing   can   be
accomplished  by  a selection from the "View" menu (example:
menu item '3D A & 3D B').  Selection of the Model A frame to
be  so  viewed is enabled by the A-CTRL button and selection
of the corresponding Model B frame is enabled by the  B-CTRL
button.

                          THE END




