phindows is a thin client to connect to a qnx box from a windows box over tcp/ip or modem. once you are connected, it acts as if you were sitting right in front of the qnx box, i.e. you can move the cursor, type in commands, start applications etc. there are different options to start with, for example you can run phindows using the same cursor as the person on the remote qnx box, or a second (third, fourth …) one. phindows requires very little resources from the windows’ side.
you can’t transfer files by these means, but samba is a good option and there is a lot of helpful material posted here.
as for the bad news, you have to buy phindows, as far as i know. if you are still interested, i can mail to you some 3 or 4 pages of the docs to let you see if it is worth your money.