you could try an rdp connection from the blackberry to the pc:
http://www.rdmplus.com/rdm/bb/index.htmlnever used this software so could no say how good it is but i bet there are loads of the same type of apps out there for blackberrys.
i would say you could have some issues doing it this way but depends on connection ect, might be worth a play as i do not see any other way of doing what you have asked.
hope it helps