On 4/20/12 8:37 PM, "Sergey Oboguev" <oboguev at yahoo.com> wrote: >> I would say Unix (and its derivatives) and VMS are Operating Systems. > >> Windows is an Application. Takes VMware to run it. > >Takes SIMH to run VMS. Really? My VAX 4000-300 not only runs VMS quite well, but it keeps my workshop warm. :-) -- Ian