I would like to use that tool in my institution

We would be really pleased if you do. We are doing all this to see people enjoying it! It's kind to drop un an email about it, but it's not even required: The tool is free software (as in free speach).

How to import the work session done on another machine?

You can either use the interface (menu "Session / export" and then menu "Session / import"), or copy the zip files that are located in the ~/.plm directory.

Another solution is copy your UUID on the machine on which you started your session, and create a user with the same UUID on the new machine. The PLM will automatically copy all your files at startup.

But my name is not Dave!

I guess that the computer just told you "I'm sorry Dave, I'm afraid I cannot let you use that function" or something similar. This happens when you try to solve a problem in a forbidden way (such as teleporting in a maze). You should not do that. Note that this sentence is a reference to HAL, as shown here: https://www.youtube.com/watch?v=ARJ8cAGm6JE

Where is the rest of the documentation?

Most of the documentation is accessible from the menu bar on the right of this page, and the rest is directly integrated to the environment.