I don't see any good replacement for the GUID, since the name e.g. can be faked. Probably you want your own Account menu mod or add something like !login secretpass

If you wanna learn a bit about B3 command parsing: https://killtube.org/showthread.php?...Command-Adding!

Also you might wanna look at IzNoGoD's "persistent client variable" thread: https://killtube.org/showthread.php?...(persistently)

The easiest (and even safest) would probably be a simple !login command tho: https://killtube.org/showthread.php?...for-Builtin-B3!)

Also, in whole CoD2 there is no magic way to generate a "secure" guid, not even with the masterserver auth instance based on the cd key. There is at least one highly played CoD2 server which steals all cd keys from it's users. For your own security, you rather wanna not put any trust in guids for non-cracked players. On the other hand, who cares about the security of ingame commands like !kick

But if a malicious server admins has the admin cd key he might be able to escalate rights via intelligent use of !set (changing server cvars) or so