I did not know that PL/1 was used in Multics but I did know that Prime did develop from it. At one point I did have Level 6 (root) on all of BT's primes and le

I did not know that PL/1 was used in Multics but I did know that Prime did develop from it. At one point I did have Level 6 (root) on all of BT's primes and level 7 on the billing systems.