Ciao Pietro,

thank you for your reply.
Our customer is working on a WEB appplication so..this should be the right way, thank you!

ciao,
Filippo

Ciao Filippo,
TC20/TC25 are value tier devices and they don't includes the full feature set available on other devices.

Key Mapper Manager is one of the Mx features that is not available on the TC20.
You can find a list of the Mx features supported by TC20/TC25 at this site:
TC20/TC25 Feature Matrix - Zebra Technologies TechDocs

In your particular case, depending on the type of application you're working on, you can obtain the same result from your application, intercepting the key presses.
If you're working on a WEB application, Enterprise Browser (the not yet released v1.8, is going to support TC20/TC25) can use a configuration where you add this functionality (press a HW button to toggle keyboard visibility) to an existing webpage.
Or you can include this capability in the web application itself using Enterprise Browser' APIs.

Ciao
~Pietro