The most similar experiment is about trying to connect an old DECT
wireless base to a PC:
http://www.grynx.com/projects/siemens-skype/
Info on this particular headset:
http://www.cordless-phones.uk.com/headsets/convertible-headsets/h141n-business-headset-duoset/?referrer=affiliate
It is possible that you aren't finding anything because not very many
people want to listen to music on a telephone-quality, single-ear
hear-
phone?
There's nothing magic about them. It is a matter of deciding how you
want to hack some kind of switch, how you want to deal with the stereo
output of the computer vs. the mono headphone, etc. I'm not sure
exactly what you are asking about?