Qt and Gnome both on system?

[Lance Hoffmeyer]

Is it possible to have Qt and Gnome on the same system and to be able to =
choose one or the other when starting X (or even switching  between them =
when runnng X?  It might be useful for comparing the difference between =
the two of them.  Also some programs only run in Qt whereas other programs =
only run in Gnome.