POSIX support
The Portable Operating System for UNIX (POSIX) subsystem is not
included with Windows XP or with Windows Server 2003. The POSIX subsystem has
been replaced with a more UNIX-like environment that is named Windows Services
for UNIX. Windows Services for UNIX is a superset of the original POSIX
subsystem and provides greater functionality for UNIX programs. Windows
Services for UNIX requires Windows XP Professional Service Pack 1 (SP1) or
later.
For additional information about Windows Services for UNIX,
visit the following Microsoft Web site:
OS/2 support
The OS/2 subsystem is not included with Windows XP or with Windows
Server 2003. An alternative solution for OS/2 programs is Microsoft Virtual PC
2004. Virtual PC 2004 supports most OS/2 programs including OS/2 programs that
have a graphical user interface (GUI).
For more information about
Virtual PC, visit the following Microsoft Web site: