User Access Licensing can coexist on a network that is using Server Connection licenses. Depending on the resources being accessed, a user might consume a User Access License and a Server Connection License simultaneously.
For example, a company has 3 NetWare 5.1 servers, each with a 10 user license. The company has 30 network users. The company upgrades one of the 10 servers to NetWare 6. When a user logs in to the network, he will consume one User Access License Unit which will let him log in to any number of NetWare 6 servers. For each NetWare 5 server he logs in to he will also obtain a NetWare 5.1 Server Connection License unit, the same as he always has.