MacX is a display server implementation supporting the X11 display server protocol that ran on System 7 , Mac OS 8 , and Mac OS 9 .
Head entity: mac os 9 Q904519 23 24 25
Tail entity: mac os 8 Q1343889 18 19 20
Relation (head \u2192 tail): P155
Inverse relation (tail \u2192 head): P156