Webtrends Analytics Query Parameters Reference, October 2013
Identifies a segment of interest. X can be 1, 2, 3, or 4. For example, WT.seg_1=Segment1.
These segment parameters are recognized by the Visitor History functionality and their values are stored in Visitor History. WT.vhseg_X can then be used in MLA Full Analysis to retrieve these values from Visitor History.
This parameter identifies values associated with this segment, and you can store these values in Visitor History. The Visitor History function recognizes these values and stores them in the Visitor History database.