Login window?
 

Now and then when my computer ran Limewire unmonitored for many hours, one and sometimes more Limewire login windows are active. They show an IP number and have two entry fields for a username and password.

Login to what/where/why?

And why are they modal? (That means: they make the rest of the user interface unusable untill you closed them)

Win2k, LimeWire 2.7.13 Pro.