Question about shift-C key binding

[Arnulf]

One thing that bugs me since the Open beta back then, what does this key binding really do?

My first thought was that it would toggle between general chat and combat log. Bringing the combat log in front of the others and back. However that never worked for me. So what is it really for?

Another thing, although only minor related, why is it that extra chat windows disappear? I usually create a window where I can monitor my healing and spell damage output. Sometimes these windows are just gone, even with locked chat settings.