How to detect User?

[GameWalrus]

I'm new and this is a pretty generic question, so I apologize, but uh how can I make it so it can recognize users and store specific value for them via SteamID and such. Would any of you perchance happen to know? I'd appreciate any help you'd have to offer, thanks.

[_Undefined]

[b][url=wiki.garrysmod.com/?title=Player.SetPData]Player.SetPData [img]http://wiki.garrysmod.com/favicon.ico[/img][/url][/b] might help.