- Interface to doscalls.dll.
- Interface to dive.dll
- Provides access to the EMX extender.
- Interface units for the Presentation Manager (PM) functions (GUI).
- Interface to viocalls.dll screen handling library.
- Interface to moucalls.dll mouse handling library.
- Interface to kbdcalls.dll keyboard handling library.
- Interface to moncalls.dll monitoring handling library.
- Provides access to the (emulated) Windows sockets API Winsock.
- This implements the various port constructs for low-level I/O.