Contents of the SWAPLPTS.DOC file
SWAPLPTS.COM is a program to switch between LPT1 and LPT2.
Everytime you run the program, it swaps the printers addresses.
For example, the first time you run it, the printer on LPT2
becomes the default printer (it "becomes" LPT1). The next time
you run it, it is swapped back to being LPT2, and the printer on
the physical LPT1 port again becomes the default printer.