The ShareScan Embedded client for Canon MEAP supports external USB (Cherry brand) keyboards. The USB keyboard detection are different depending on the versions of the client.
Canon Jar version 5.2.20626.0 and newer allow the keyboard to be plugged in after ShareScan has been started.
In versions older than the above, the presence of the USB keyboard was detected at application launch time.
Review latest jar version access and server requirements at the above link.