Step 1: unpack the included .rar to MPMissions folder
Step 2: start a multiplayer server
Step 3: play the vehicletest-mission with a friend
Step 4: try to get in all of the vehicles
Step 5: observe as the hosting player is able to enter all vehicles, while the client is not
Step 5: play the vehicletestNOSIDE-mission
Step 6: try to get in all of the vehicles
Step 7: observe as both players are able to enter all vehicles