[MSDN Library June 1998] Implementation of Subsystem (100%)

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT Workstation 4.0 Resource Kit > Chapter 29 - POSIX Compatibility

[MSDN Library June 1998] Implementation of the OS/2 Subsystem (90.625%)

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT Workstation 4.0 Resource Kit > Chapter 28 - OS/2 Compatibility

[MSDN Library June 1998] Implementation of Subsystem (70.3497023809524%)

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT 3.51 Resource Kit > Windows NT Resource Kit Volume 1: Resource Guide > POSIX Compatibility

[MSDN Library June 1998] Implementation of the Subsystem (63.9988959293395%)

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT 3.51 Resource Kit > Windows NT Resource Kit Volume 1: Resource Guide > Windows 3.x Compatibility

[MSDN Library June 1998] Implementation of the OS/2 Subsystem (61.7559523809524%)

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT 3.51 Resource Kit > Windows NT Resource Kit Volume 1: Resource Guide > OS/2 Compatibility