Ok, this one has be stumped. Sharing a printer on a heterogeneous network (ie Macs, PCs). First understand that File Sharing is working in both directions; Mac files are accessible to the PC and conversely. Second, the printer in question is USB attached and when connected to the Mac, the Mac can print to it; when connected to the PC, it can print too. File Sharing setup uses User/PWD to access the shares belonging to that specific user. SO, one would assume that it would be trivial to Add Printer, point to the other system, select the printer that is shown as shared and you're done. GRRR -- nope. The desire operation is to have the Printer Shared on the PC and the Mac to access it. From the Mac (OS 10.4.11) accessing the PC(Win/7 Pro SP1) attached printer, nothing appears in the print queue on the PC and various errors occur attempting to print to it: Here are the setups (2) that I have tried. 1) the from the Mac Print Browser -> Windows Printing (should use ports 137,139) -> Network Neighborhood -> Workgroup Name-->choose-->Pc Name->user/pwd error 256: unable to connect using user/pwd given [ humbug! same user/pwd works for Files! ] 2)Add Feature to the PC (LPD) and add IP Printer->give lan address of the PC and it gets validated, selecting Generic Postscript Device Print->select IP Printer-> shows Starting Job and progress forever, nothing being queued on the PC. I would assume that Print Shares would be accessed by the GUEST account.