Not quite sure what you are after here, but you could
write a batch script for each of your applications that
writes out a log file of who and when it was last used.
Better yet, you could enable auditing on your applications
and then just look at the eventlog to see who and when
used what.
Ok...if you are just looking for raw application usage,
then just enable auditing on the application. Right click
the application, get properties on it, and then enable
auditing. You'll then be able to see who is access the
application by looking at the event viewer.