Absolutely yes.

Enjay Ensight Viewer is an independent viewer, where group admin can view & monitor all the users that have been assigned to him, its functionality same as that of Enjay Ensight Console (except that it does not store analytical data)

Enjay Ensight Client is the Agent that gets installed in each and every PC, it is essential for it to work so that monitoring and reporting data is sent to Enjay Ensight Console properly.

Some times it may be the case that there might be a departmental manager who manages his users, and then there is main administrator who monitors each and every one. So now in the PC of departmental manager, there will be both things installed - Enjay Ensight Viewer as well as Enjay Ensight Client.