simple script, no idea where to start

what im looking to do is have a client report back to the server the value of a local variable. depending on what that value is, i either want the server to do something or not do something. is there anything like this out there already?

…What?

There is a built in system to do this, using CreateClientConVar with the ‘userdata’ set to true.
An alternative is to make the client send a concommand every time you want the value.
Be aware that a user could easily spoof anything coming out of a client, so don’t ever trust things sent to you by them. Treat all input as malicious.