3 dos.obj ......................... Helper functions for DOS I/O to far and huge memory
4 emm.obj ......................... Utility library to make use of the Expanded Memory Manager (usually, EMM386.EXE)
5 dosbox.obj ...................... Utility function to detect if we're running in the DOSBox emulator
6 biosext.obj ..................... Utility function for real-mode software to use BIOS INT 15H AH=0x87 extended memory copy function
7 himemsys.obj .................... Utility library to make use of Extended Memory via HIMEM.SYS