GUID is used for?

Hi, i have been reading up on interop recently and i have found out there are many codes that requires the use of GUID. May i know what is a GUID for? and how can i get a GUID?
jaxrpcAsked:
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ZeonFlashConnect With a Mentor Commented:
The function that lojk referred to is:

Dim Guid As String = System.Guid.NewGuid().ToString()
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g_johnsonCommented:
GUID = Globally Unique IDentifier.

One way to "get" a guid is from SQL as a "NewId"
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lojkConnect With a Mentor .Net and Infrastructure ConsultantCommented:
.net has a createguid function i believe but ive never really had any reason to use it.. It usually adds GUIDs itself where it needs them (i.e .net Components that are exposed via COM)...
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lojk.Net and Infrastructure ConsultantCommented:
yep... thats the monkey...
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