mission sequence problem (on player disconect)

[dragonsyr 21]

I have a unit preplaced from editor.

when the mission begin, i have an addaction for the players , that can use this unit (movements, waypoints) so far so good. while alive player everything is under control because the script continues.

i want ,if the player is dead or disconected for some reason, the unit go back to the initial position and some actions that made before killing or disconnection also remove.(ex. spawned vehicles )

how can i do that?

edit: also how can i lock the unit so when a player use it , the other players cant ? same thing here..... i need to unlock when player dies or disconected