Request for use of the virtual computer RAM

Hi all

I have 3 x VM running to work in a box, each machine was given to 16 GB RAM allocated.
My confusion is when a virtual machine starts and become inactive, the memory usage levels out and remains the same (as you know).  However when an application is launched, and the memory usage is used, it is never 'product' when the application closes.  So finally, during the day the memory used displays 99% and will never fall.  There are never problems with caution and no request may not work, but I found this strange behavior...
Is this a normal behavior?  Can someone explain the logic behind this?
Thanks :)

Given that most of the individuals are not running Virtual Machines, I would say that your question belongs better in the IT Pro community:

http://social.technet.Microsoft.com/forums/en-us/categories

Tags: Windows

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