If no application has been started yet, the 3Dfindit client starts; if this is not possible, the 3Dfindit client starts PARTdataManager if an application is already running, the user is asked whether he wants to start 3Dfindit or PARTdataManager wants to start.
Also see Section 2.6.2, “ Insert from the standard and purchased parts library via "PARTdataManager"” bzw. Section 2.6.3, “ Insert from the standard and purchased parts library via "ENTERPRISE 3Dfindit" ”.