The Teamcenter (tc.war) web application becomes available when you load the ICD's from wntx64 media for base and patches. The Distribution Server (RMI and Distribution Server) and Distribution Server Instance (OTW 4tRAC) web applications become available in INSWEB when you load the ICD's from otw media for base and patches.
Example for Tc11.2.2: tc.war - Tc11.2.0a_win64\Web_tier\icd Tc11.2.2_wntx64\wntx64\Web_tier\icd Distribution - Tc11.2.0_otw\icd Tc11.2.2_otw\otw\icd
BTW, this has nothing to do with Dispatcher. It is Distribution, a way of delivering the 4t rich client (OTW - Over the Web).