What does "On-link" mean on the result of "route print" command?

What does "On-link" mean on the result of "route print" command? I'm using Windows 7. When I type "route print" under command prompt, I get a IPv4 Route Table with several "On-link" values under the Gateway column. For example, like this one:
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Guest [Entry]

They are addresses that can be resolved locally. They don't need a gateway because they don't need to be routed.

Guest [Entry]

on-link is a vista thing and it means there is a direct connection meaning “directly reachable”. In general, such record will be generated after establishing a dial-up connection.