changing view with keyboard

[salty_dogs]

i usually work with one viewport filling the entire screen in both autocad and rhino. ive tried using the keyboard in viz to switch back and forth between views, top(t) right® camera©, etc. what ive found is that the view is not maintained. in other words, if i go from top to camera to right to top again, the second time i switch to top the view area has changed. what gives? is this something i can change or is it just the way viz works? is the view name dependent on something like the reference coordinate system?

[MJL Imaging]

The only thing I've learned to do is save the view. I usually save a perspective view and toggle through the other,s like top, left, right. When I go back to the view, I restore the active view. If anyone knows how to hold the view by default, I agree, it'd be better.