Memory on Window 2008

What's the meanings for the following counters under Windows Task Manager - Performance ? What does this value refer to ? When does it indicate a memory shortage ? Tks

Physical Memory (MB) - Total , Cached, Available and Free
Kernel Memory (MB) - Paged and Nonpaged
AXISHKAsked:
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Vaseem MohammedCommented:
As per my understanding - Physical Memory displayed in MB
Total - Amount of memory installed in system, (RAM Sticks?)
Cached - The space / amount of memory used by system, background services, processes etc.
Available - system can use it, may be something like pre-cached or ready to be used.
Free - blank space, not claimed by any application

its a bit hard/confusing to understand Available and Free.

paged - The data in memory which can be moved to pagefile on hard drive if needed when system needs more RAM.
Nonpaged - data in memory which cannot be moved to pagefile on hard drive.

This is how I understand, may be the article below will give you more details and better understanding.
http://blogs.technet.com/b/supportingwindows/archive/2013/05/03/finally-a-windows-task-manager-performance-tab-blog.aspx
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AXISHKAuthor Commented:
Tks
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Windows Server 2008

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