samba - Sep 2003 - What is the meaning of create mask / directory mask

Hello, could somebody please try to explain...

   create mask = 0660

   directory mask = 0770



plus the  "force.....  =  "





I don't understand the meaning of 0660 , why 0 infront of 660. Sometimes i
see something like 2777 ?



i understand commands like chmod 777. but i don't understand this.





Thanx,

Marco