CP-V (Control Program fiVe---Xerox Sigma 6/7/9, etc.)
DOS (Windows 3.x is an environment/application).
Windows 95.
Windows NT
OS/2 (and OS/2 Warp).
Unix (and it's variants).
Linux
at Andrews.
Solaris 2.5
. on UltraSparc, Pentium Pro, PowerPC by
Sun
.
Check this for
security info
.
Macs have an operating system, but why would I care?