Good Afternoon everyone,Just like the topc title says i'm considering flying on VATSIM. I'm new into the forum so i hope this is the right location for my (newbie) questions. I did some research but I can't find all the answers. Let's kick off (or should I say take off :( )Are 3rd party scenery add-ons allowed on Vatsim like FlyTampa's Orlando (KMCO) for example? The reason for asking; what will happen if Simmer A owns the add-on and Simmer B not. While ''Simmer A'' thinks he is parked gently at the gate it can look like he is blocking the taxiway due to differences in the scenery.How does the ''AI'' work? I understand their is no AI like flying offline but how can I see other traffic when I'm not in prossesion of that model. For example; I'm taxiing on a busy airport meanwhile someone else taxiing with a Level-D 767 which I don't own. How am I enable to see the traffic? The same question rises to me with liveries I don't have installed. Will I just see a grey aircraft?Can I see people who are using FSX on VATSIM while I'm online with FS9 and vice versa?I looking forward to read the (hopefully) responses.CaptainSlow