Solution for extending your desktop display using displays of another computers (including Pocket PC), using network connection. Like VNC, ZoneScreen able to mirror local desktop to another computer in the network. The main difference is that it also allows extend desktop, not only mirror it. Also, you could use ZoneScreen for Windows Mobile to extend/mirror your desktop to screen of your handheld.
All you need for ZoneScreen to work is network connection Between your computers (your computers are both connected to the same network, or connected directly with cross-over cable or 1394 firewire cable, etc). In case you are using Poket PC, you may also use connection provided by ActiveSync (using cradle cable, IR port, etc).