detect single player game

[Ras]

i see in tr1nity Orpg . the system of detect single player and desactivate the save and load .. Since it can be created?

 

[Mac_MacNuggets]

Set playernumber (integer variable) to 12
Pick every player from all players and do actions
If player slot is a computer is true
Or
If player slot is not playing is true
Or
If the player left the game is true
Then set playernumber to playernumber minus one
Else

 

[Ras]

THANK you