https://sm.alliedmods.net/new-api/co...ryClientConVar
QueryCookie QueryClientConVar(int client, const char[] cvarName, ConVarQueryFinished callback, any value)
"any value" just allows you to get the value that you passed to the callback function (last parameter above). "const char[] cvarvalue" allows you to get the actual value of the convar. If you're asking how to get different types of values, then you can just use the StringTo* functions on the cvarvalue string.
StringToInt(cvarvalue)
StringToFloat(cvarvalue)
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