Generally, ClearCase usage is governed by a floating license scheme so you should really just focus on installing and configuring the license server
http://publib.boulder.ibm.com/infocenter/cchelp/v7r0m0/index.jsp?topic=/...
Obviously, you also need to install the ClearCase client software
http://publib.boulder.ibm.com/infocenter/cchelp/v7r0m0/index.jsp?topic=/...
It is possible to have named licenses and in that sense you are configuring a user. But generally if you use ClearCase from the Windows client or from the command line you will acquire a floating license and be all set.
Bob Aiello
Editor in Chief