Create an input file, e.g. problem.dat. The default input file is tn.dat, which will be used if no other input file is specified. Thus the command tochog or tochnog tn.dat yields output on the screen while tochnog tn.dat tn.out redirects the output to a file. On a Unix system you can run the job in the background with tochnog tn.dat tn.out &. On a Microsoft windows system you need to run from a Dos shell.
Use the condif1.dat test to get started.
Afterwards do the same for the test repeat1.dat. It is simple, but shows some of the advanced features of TOCHNOG. Finally look at the test repeat2.dat. After that you understand much of the program.
Finally, read at least once the start of the data part section.