Base tools to exchanges messages using text message files.
In fact, it is a redirection of the disp output function to the message text
file and the input output function from the message text file. The exchange of
messages is bidirectional and is carried out using two text files: messages are
read from one file, and messages are written to the other file. Moreover, only
one process can write to a specific file. These two files are located in a
directory called the messaging point. The name of such a directory is the name
of the messaging point. If such a directory is in the cloud storage, we get the
ability to exchange messages over the Internet.