A very common scenario when doing interfaces with other applications, is to have a directory where one application places files, and the other one picks those up and processes them.
Let’s say some application want to interface with Dynamics AX, one way, from that application to AX. That application will drop files of a specific format, say *.txt, in a directory. You’ll want to have a batch job in AX that checks that directory every 5 minutes for those files. When your batch job finds those files, it will open them and do something with that data, then move them to an other directory, so you don’t process them twice.
Now the first thing you’ll probably think of (well, I did…), is to use the class