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

MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT Workstation 4.0 Resource Kit > Chapter 27 - Windows Compatibility and Migration > Compatibility with Windows 3.x

[MSDN Library June 1998] Implementation of the OS/2 Subsystem (45.6198761555904%)

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

[MSDN Library June 1998] Implementation of Subsystem (45.0329585928664%)

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 (44.0920983778127%)

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 Subsystem (41.6705174625682%)

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