Is a uniquely generated ID for each browser or end device for the effective use of RTA functions. For doing so, a 3rd party cookie is generated by Mapp Intelligence, that is not account specific.
The Global End device Visitor Id is not available as dimension in Mapp Intelligence, but only exists in the raw data export.
The cookie generated for this purpose is called "wt3_geid" and is saved in the domain "*.wbtrk.net".