ADD allows you to insert a new viewport on the display. 
The maximum number of viewports is defined in the CONFIG
program.

Indicate the position where you want the lower left corner
of the viewport.

Move the rubberbox to indicate the size and position of 
the viewport and press the cursor button.

Overlapping viewports are not allowed and therefore
ignored. The new viewport is created in a top view, 
View 1.
