If you've already set up the network e.g. MSHOME, set the printer to "share" (from the printer panel on your desktop) and "add new printer" from the laptop. Hopefully if both are on the same workgroup you will see the printer listed as a network item, add it, and try it.
It has been suggested here that to ensure success, physically installing the printer on the lappy first then reconnecting it to the DT will help the above.
To print wirelessly from the lappy, your desktop will have to be on.