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The executables included in this package were compiled with the WATCOM C compiler. This is a full 32 bit compiler that makes good use of the 386 processor and does not work on the 16 bit 286. It also has the advantage of allowing the flat memory model to be used. In practice this means that porting programs like alscript from Unix computers like the Sun, is straightforward. In order to access the memory of the computer in this way, an extra program called a dos extender is required - this is called DOS4GW.EXE. DOS4GW is automatically invoked every time you run one of the programs and is responsible for managing the memory and creating the swap file discussed above.