Peter, you can use the third parameter if you like to prevent transferring robots back to yourself. However, that will make it uncompatible with the parameterless version. Therefor the use of teleporters will become completely unpractical. The way vb6 sends the parameters is it shells DarwinBotsIM.exe with them, you may consider moving and renaming your 'client.exe' to 'DarwinBotsIM.exe'