killed ctview objects

[Guido.Bosch@loria.fr (Guido Bosch)]

Is there a "silent way" to test whether a ctview object has been
"killed" ?

By "killed", I mean: If one has clicked with the mouse on the little
hollow rectangle in the upper left corner, which makes it disappear
forever. 

By "silent", I mean the following: There is a "noisy" way:

		(send 'show <ctview>)

which returns the number 1 if the <ctview> has been killed. But if it
hasn't, it will be exposed, so this cannot be used as a "silent" test
without visible side effects.

What is the right function to test whether the <ctview> is still valid?

	Guido