Since you didn't specify the OS of your Terminal Server, If it's is 2003 then you do need 2003 Windows CALs & 2003 TSCALs for each connection
2000 Licensing info here
http://www.workthin.com/tsls2k.ht
2003 Licensing info here
http://www.workthin.com/tsls2k3.ht
As Vera stated there is no set limit on how many RDP connections a single server can handle, but here are some configurations that will give you a sense of how many connections your TS might handle. Do your own testing BEFORE deployment
http://www.workthin.com/tshw.ht
Patrick Rous
Microsoft MVP - Terminal Serve
http://www.workthin.co
----- Vera Noest [MVP] wrote: ----
Assuming that your TS runs W2K, then you don't have to buy any TS
CALs for W2K Pro or XP Pro clients
BUT: these clients do *not* have a build-in TS CAL, they get a free
TS CAL from the TS Licensing Server. So you must install and activate
a TS Licensing Server (on your Domain Controller, if in a W2K
domain)
There is no hardcoded limit to the number of connections that a TS
can support. All depends on your hardware, the number and type of
applications, etc