A Mars session record is useful for two purposes:
You can make a session record with 5 simple steps.
If the code file is not yet open click on the "Open File" button. Use the "Open" dialog to navigate to and open the code file.
If the program uses multiple files you only need to open one of them so that Mars knows what folder it is working in. This assumes that you have checked the "Assemble all files in directory" check box in the Mars "Settings" menu.
Click on the "Save As" button. Save the file with a name such as "session.txt".