Found this online web based diagramming software for a server called Diagramo. They actually have three versions. A tryout version, MSWindows, and a lamp server version. We downloaded the tryout version and the lamp version. The light version is great for training, but does not allow for the saving or loading of files. Now to install the lamp server version.
Could not get the lamp version to work. Was welcomed with just a blank screen. After a web search, went to the git repository for the latest version. It worked, but would not let you log in. Tooled around to the setup page for setting the login and ran it. Then things worked. You should not have to do that to set up software. They do have a nice basic how to use the program with a default diagram. Was able finally to be able to use the program. Will be interesting to see how to use the web page to a tablet.