What is a GUID?

A GUID is a Globally Unique Identifier is a unique reference number used as an identifier in computer software.


GUIDs are usually stored as 128-bit values, and are commonly displayed as 32 hexadecimal digits with groups separated by hyphens, such as {21EC2020-3AEA-1069-A2DD-08002B30309D}. GUIDs generated from random numbers contain 6 fixed bits saying they are random and 122 random bits; the total number of unique such GUIDs is 2122 or 5.3×1036. This number is so large that the probability of the same number being generated randomly twice is negligible; however other GUID versions have different uniqueness properties and probabilities, ranging from guaranteed uniqueness to likely non-uniqueness.


How are GUIDs used in iSite?

GUIDS are primarily used behind-the-scenes in iSite to uniquely identify objects.  For example, rather than referring to a Task in iSite by a Task Number, iSite will refer to the Task by a GUID, which is assigned when the Task is created.  In iSite, once a GUID is created and assigned, it is never changed.  However, Task Numbers can actually be changed after they are created.  Because of this, iSite refers to the Task by the GUID because of the fact that it will never change.


Where are GUIDs used?

GUIDs are used to identify just about every object in iSite.  From Users to Tasks to Estimates and much more, the GUID is a foundational identifier of objects within iSite.


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