The KDE style guide specifies both a Close and a Quit. 
See
http://developer.kde.org/documentation/standards/kde/style/menus/file.html

( Last week I announced this version and asked for feedback,
especially from people working on koffice. I have got one reaction
so far from Werner Trobin who seemed to like it)

In developer terms: "Close" basically closes the document but not the
window and "Quit" closes the document and the window. 

Cheers,
Waldo

On Mon, 29 Nov 1999, Simon Hausmann wrote:
> Ok, that was probably not a good answer :)
> 
> The question is: What is the right thing to do, Waldo? :)

> On Mon, 29 Nov 1999, Simon Hausmann wrote:
> > Ok, it was no real discussion ;)
> > 
> > http://lists.kde.org/?l=kde-cvs&m=94371260103163&w=2

> > On Mon, 29 Nov 1999, Waldo Bastian wrote:
> > > Where was this discussed?

> > > On Sun, 28 Nov 1999, CVS by shausman wrote:
> > > > kdebase/konqueror konq_shell.cc,1.8,1.9 konqueror_shell.rc,1.3,1.4
> > > > Author: shausman
> > > > CVSROOT: /home/kde
> > > > Sun Nov 28 01:59:01 MET 1999
> > > > Update of /home/kde/kdebase/konqueror
> > > > In directory zeus:/tmp/cvs-serv18291
> > > > 
> > > > Modified Files:
> > > > 	konq_shell.cc konqueror_shell.rc 
> > > > Log Message:
> > > > - removed (commented out) File->Quit ( as discussed :)