Single viewport... good catch, I almost never have a single viewport, so it didn't even cross my mind.
What do I have in mind?? Aside from ... er... nevermind.
Working with large 3D models with DVIEW clipped views, typically we'll have 4 viewports (tilemode=1) one big one to the right, and 3 "stacked" vertically to the left. Each with a different view of the model. Currently we use a slightly automated VIEW SAVE/RESTORE function to bring up specific views for editting, it would be nice to just swap existing views from a little viewport to a larger one.
VBA?? I'm still working on that... gee who am I kiddin', I'm still learning lisp..