HP HIL ID module: what's it for?

It's up to you waht you collect, but I wouldn't exclude it from such a colelction because it was an HP-HIL peripheral. It may not be very useful, but that's no the point... I'd quite like one, but all the ones I see on E-bay are far too expensive (or have ridiculous shipping for something that's about the size of a cigarrette packet) to be worth buying. WHat HP-HIL devices do you knwo about? The manual I have mentions the following : HP35723A touchscreen bezel HP46021A keyboard. There is also the 46020 keyboard which is functionally identical, but very differnet internally. That matters to me... HP46060 mouse HP46080 extension module (a line driver to add 8 feet of cable) HP46081 Audio/extension (Same line driver as the 46080, but with a speaker included, which AFAIK has noting to dow ith the HP-HIL side) HP46082A/B Audio/extension. Longer distanve line drivers HP46083 Rotary knob. This is a signle twiddleknob with a button on the side to seelct what it does (normally X or Y position) HP460-84 ID module HP46085 Control dials. 9 User-definable twiddleknobs. Thaes up 3 of the avaialble 7 addresses (!). HP46086 function box : 32 definable funciton keys HP46087 A-size digitizer HP46088 B-size digitzer HP46089 4-button cursor (a puck for the 2 digitizers, not really an HP-HIL device) HP46094 Quadrature port. For using Quadrature mice, trackballs, etc HP98203C keybar. A 'compact' keybaard. HP92916 Bar code reader For completeness, there's also the HP Inegral keyboard which is an HP-HIL deviec and differnet to any of the other keybaords. The keyboards also camme in various national layouts -tony