returns true if this users looks like they are behind a NAT device. Only valid once the user has connected to steam
(i.e a SteamServersConnected_t has been issued) and may not catch all forms of NAT.
public static bool BIsBehindNAT() { InteropHelp.TestIfAvailableClient(); return NativeMethods.ISteamUser_BIsBehindNAT(); }
