Wireless printing I have an HP wireless laptop and a Lexmark Officejet printer that is connected to the desktop computer via cable. What do I need to do to print wirelessly to this printer?

I assume you have a wireless network set up with a wireless router, since you said you have a wireless laptop.
You need to share the printer on the desktop. You also need to set up both computers to be on the same network (for example, WORKGROUP or MSHOME, or a name of your choosing).Once shared and on the same network, you can go to the laptop and add a printer--just tell it that it is a network printer.
A caution--to work without further hassle, both computers need to be running the same version of Windows. If not, you'll need the driver disk for the system on your laptop.

You need a WLAN printer server
Select a model compatible with your printer connection (USB or LAN or parallel)
Be aware multifuntion printer are not supported in Wlan.
All network hardware supplier offer this kind of network device
Google for:Wlan printer server

Share the printer via network. Install the printer driver on your laptop then add the printer that was shared by the desktop using the shared drive.

Right click the printer in the printers folder and select sharing. Check share this printer and give it a name. On the laptop got to start/run and type \\xxx.xxx.x.x (the ip address of the desktop). There you will see the shared printer where you can connect to it.

Good luck!!