says winmo 2003 5 and 6..but stops there..
http://www.tranexp.com/win/PocketKeys-chj.html
looks promising..
http://www.resco.net/forums/ShowPost.aspx?PostID=7503 scroll down through posts and they get very current quickly.. didnt see OS spefically but one guy mentions his touch HD, so who knows.. read, dont scan that one like i did..
Hmmm..something from microsoft..
http://msdn.microsoft.com/en-us/library/bb431750.aspx IDK, but may help somehow
Thats about all i got at a glance..
This thread of yours made first page google search to on it lol.. well hopefully i put ya in the right direction atleast..