gunaselanvyahoocom

Simple simple question,

What are your thoughts on testing application for those 3 modes. Let me
explain more. Plans are to move to classic first then aero. Would
application need to be tested for compatibility in all 3 modes?Or would
testing application in any one mode be sufficient to say applications
are Vista compliant

Any details appreciated- Architecture of the way Applications interact
with Vista when moving from one mode to another.

Thanking everyone in advance