Some of the programs indicate that printing is possible. However, in the newer versions of Windows, the DOS emulation no longer supports printing.
The program permcalc is unfinished, but still functions sufficiently to enable students to see that the cycle structure of the permutation x -> ax (mod m) is very different from that of a random permutation.
In the case that bugs are discovered, or a program fails to operate satisfactorily, please report the details to hlm@umich.edu.
Some of the programs terminate when the calculation is completed. Such programs cannot be operated by clicking on the Windows icon. To operate the program, open a DOS window, change the directory to the one containing the program, type the name of the program, and press [return]. The DOS window can be toggled between small and full-screen by typing [Alt]-[Enter]. To see a listing of the files in the current directory, type dir /w [Enter]. The DOS window can be closed by typing exit [Enter].