The program runs interactively by default, the presence of a file called 'postansys.str' will switch the program into batch mode. When in batch mode the program does not output text to the screen, however the log and com files are still produced.
The log file 'postansys.mes' contains all information relevant to a single run of the program including any errors. This file is overwritten each time the program is executed.
The com file 'postansys.com' contains a list of commands used in the last execution of the program. The '!' character serves as a comment and this file is suitable for conversion to a startup file. This file is overwritten each time the program is executed.