The keyboard is a widget that was meant to act as a universal keyboard that used FMAR's base input systems, and behaved consistently between platforms.

It made a lot more sense at a time earlier in the project's development when widgets were thought of capable of being "multitasked", i.e., you could have multiple windows up at the same time each with a different widget. It certainly doesn't make a lot of sense with the current philosophy behind widgets which is to consolidate them all into a "Tabbed Display".

We ended up prioritizing other things, and the effort was never fully carried out. We also found that simply using the provided system keyboard for each XR platform (e.g. the built-in keyboard for Meta Quest, etc.) worked well enough for our needs, and there was no real need for a universal keyboard.

However you might find it interesting or useful to look through the code for this tool anyway.