I just ran nmap on my linux box, scanning its own IP, and it reported

515/tcp open printer

What does that mean? A portscan from my Windows XP box revealed

515 :lpd :lp Malformed from address

Does this mean I can print to the printer attached to the Linux box from a windows box using the IP address, rather than having to enable Samba and set up SMB ****??

Also, the nmap question - does nmap scan UDP ports as well as TCP??