VMS

<operating system, product> DEC's proprietary operating system for its VAX minicomputer.

Many Unix fans generously concede that VMS would probably be the hacker's favourite commercial OS if Unix didn't exist; though true, this makes VMS fans furious. One major hacker gripe with VMS concerns its slowness - thus the following limerick:

  There once was a system called VMS
   Of cycles by no means abstemious.
        It's chock-full of hacks
        And runs on a VAX
   And makes my poor stomach all squeamious.
 
           -- The Great Quux

FAQ.

Usenet newsgroup: comp.os.vms.