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.