Its worth remembering...
In Multiplayer, the scenery that you see on your screen, is ONLY
your own installed scenery and computer settings, on your version of the flight sim, FS 2002/FS 2004/FSX.
The same goes for the Time of Day, and Time of year, and Weather conditions, every player will see something slightly different, unless you agree beforehand to set the same identical conditions!
Even the Airfields will be slightly different, depending upon the Flight Sim, default/installed Mesh Elevation, level of Scenery settings, etc...
The scenery that you see on your Monitor is only your own scenery!
Its still lots of fun though, and the flight will be somewhat similar for both pilots!
P.S. The same goes for Aircraft. The Sim Multiplayer was designed to use the Default aircraft for all players. You will only see other Pilot's downloaded
aircraft if you have exactly the same downloaded aircraft and textures in your
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.