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xDM Library Tools 100 is the basic editor used in the PADS Integrated flow, PADS Professional flow and Xpedition Flow. The 200/300 products provide additional capability for Xpedition flow user's who use xDM Library (previously known as DMS). If you use xDM Library then you will most likely have licenses for and access to the 200/300 products and can review the documentation for a description of the capabilities. If you use PADS/PADS Professional or Xpedition with just a Central Library then you will only need 100.