Thanks for the witty (ie useless) replies. Perhaps if you don,t know the answer you shouldn,t bother :-/
...a new Member without our usual sense of Humour...

..!!
A simple way, as Host, to prevent unwanted folks from spoiling the session, is to PM your selected (trusty) friends with a Password to enter the Multiplayer Session.
Without the correct password no-one else can join.
F...G-BPLF....FS 2004... 8-)...!
don,t...= Comma.
don't...= Apostrophe.
...

....!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.