Ask if a user in in the specified group, results returns async by GSUserGroupStatus_t
returns false if we're not connected to the steam servers and thus cannot ask
public static bool RequestUserGroupStatus(CSteamID steamIDUser, CSteamID steamIDGroup) { InteropHelp.TestIfAvailableGameServer(); return NativeMethods.ISteamGameServer_RequestUserGroupStatus(steamIDUser, steamIDGroup); }