This week I ordered one of the wireless Mach3 pendants from ebay, which was shipped from Automation Technologies. USPS dropped it off today and I got a few minutes to play around with it tonight after the grandson went to bed.
The install was pretty simple, just copy the plugin from the cd to your plugins folder of Mach3. There's also a macro for zeroing your z axis to copy to the macros folder. Then just plugin the wireless dongle and wait for Windows to recognize it as a USB input device, start up Mach3, and power on the pendant. Instructions were a little hard to follow between translations and briefness of them, but wasn't too bad.
The readouts on the pendant are updated in real time and you see both machine coordinates as well as work coordinates.
Just a quick test...