[SilentSoul]

https://sampwiki.blast.hk/wiki/Keys
Key found:

pawn Код:

KEY_SECONDARY_ATTACK    16  ~k~~VEHICLE_ENTER_EXIT~     ~k~~VEHICLE_ENTER_EXIT~     ENTER   ENTER

https://sampwiki.blast.hk/wiki/OnPlayerKeyStateChange

Example :

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_SECONDARY_ATTACK)//new or old it's really up to you
    {
        SendClientMessage(playerid,-1,"You pressed Eneter.");
    }
    return 1;
}