Har nu hittat svaret på varför bl.a HP PSC 750 inte kan dela skrivare, fanns självfallet hos HP:
http://h20015.www2.hp.com/en/document.jhtml?lc=en&docName=bpu04830
ISSUE: Can the HP PSC 700 series, HP PSC 900 series, HP PSC 2100 series, HP PSC 2200 series, or an HP Officejet V series all-in-one product be used over a network?
SOLUTION: These HP all-in-one product(s) are not network ready. Full functionality can only be achieved when directly connected to a computer. Since full functionality is not possible, HP does not recommend connecting these product(s) over a network. Other HP all-in-one products are fully network ready. The models that are network ready are:
* HP Officejet D series
* HP Officejet G series
* HP Officejet K80
* HP LaserJet 3200 series all-in-one models
* HP LaserJet 3300 series all-in-one models
In the event that a network connection must be made using the HP PSC 700 series, HP PSC 900 series, HP PSC 21000 series HP PSC 2200 series, or the HP Officejet V series, partial functionality may be possible when connected using an HP Jetdirect 175X print server or by using Windows Print Sharing.
NOTE: The HP all-in-one Multifunction devices are not supported with the HP Jetdirect 175X printer server on a Macintosh.
Tack till all hjälp som jag fått - lite förvånda över den länk jag fick - han kan bara inte ha lyckats med detta, hans skärmdump måste vara från den av datorerna som faktiskt kan skriva ut.