-PAM-enabled OpenSSH is known to function with privsep on Linux.
-It does not function on HP-UX with a trusted system
-configuration. PAMAuthenticationViaKbdInt does not function with
-privsep.
+PAM-enabled OpenSSH is known to function with privsep on AIX, FreeBSD,
+HP-UX (including Trusted Mode), Linux, NetBSD and Solaris.
+
+On Cygwin, Tru64 Unix, OpenServer, and Unicos only the pre-authentication
+part of privsep is supported. Post-authentication privsep is disabled
+automatically (so you won't see the additional process mentioned below).