MSDN Blogs - CAL Overview
Multiple servers in domain: Microsoft server CALs can be used to access multiple servers of the same kind throughout your domain. For instance, if you have a Windows Server 2003 Device CAL for a workstation, that Windows Server 2003 CAL gives that workstation the rights to access any Windows Server 2003 throughout the domain, not just a single Windows Server 2003.
Wed 18 Feb 2015 02:25:53 PM AEDT - permalink -
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http://blogs.msdn.com/b/mssmallbiz/archive/2007/11/06/5942350.aspx