The columns in xp's task manager differ from the ones in vista/7 and that's why I'm asking that question.Which column in vista's task manager shows the amount of memory that a program had allocated?
The Memory column under the processes tab... Same as XP if I understand your question correctly.
Edit: Misunderstood your question. Here's a rundown of what each memory column does from Windows Help.
Probably Commit Size you're looking for?