Modification of Exterminator-2 PC-version

Exterminator-2 has been modified to make it friendly usable. The input file now is an external file substituting the tedious screen inputting mode. the new version of code allows instructions to be written in the input file saving the time for learning them from the code manual. Comment and blank lines inserting is also allowed in the input file. Graphics services and automatic selection of represented data from the output file of Exterminator-2 are now available with the code. Other programming modifications were also necessary to run the code on our PCs. (authors)