adbkbd —
support for ADB keyboards
adbkbd* at nadb?
wskbd* at adbkbd? console ? mux 1
wsmouse* at adbkbd?
The adbkbd driver handles most ADB keyboards within the
  wscons(4) framework. It also
  provides an interface to translate key strokes to mouse button events.
Which keys are translated to mouse button events can be configured
    for each individual keyboard via
    sysctl(8):
  - machdep.adbkbd0.middle
- Controls which scan code is used for middle mouse button events. Default
      is 103, which corresponds to F11.
- machdep.adbkbd0.right
- Controls which scan code is used for right mouse button events. Default is
      111, which corresponds to F12.