memory usage - any better tools than task manager for memory usage analysis

In a 2000 Terminal Server I have a situation where more memory is being used than task manager shows being utilized by various processes - in other words I add up all the memory of task manager processes and it doesn't add up to the amount that is being used. I'm out about a gig. One of the symptoms seems to be that after a certain number of users - regardless of who those users are - when the next user gets on a big whack of memory disappears and yet the user's processes don't explain it. It doesn't make a difference who the user is or what they are doing - it's as if there is a boundary and then when that boundary is hit a big clump of memory gets 'reserved' for the next clump. Are there any tools outside of task manager that show exactly what processes are taking up RAM - in other words account for every 'bit' of RAM - what's where - almost a memory map.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

One of the best tools for this would be sysinternals proccess monitor

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It will allow you to look for specific dlls, memory usage

sorry that link should have been to process explorer

but process monitor may help you to if your looking for disk access bottlenecks

process explorer
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Utilities

From novice to tech pro — start learning today.