1. Make a server with 2 people.
2. Make mission with 2 players and an ammo crate. Place the crate 10 meters or farther away for the purpose of this step-by-step guide.
3. Both players walk up to the crate.
4. First player opens inventory on ammo crate.
4. Second player opens inventory on ammo crate.
6. First player walks away (With or without inventory still open).
7. The second player will have his inventory closed.
8. To do these steps again, first both players must walk approx. 10 meters away. Then continue at step 3.