EDITOR:WITH-POINT?

What exactly is the purpose of this macro?  I mean, I can see from the
editor source code that it adds cleanup forms which'll eventually call
EDITOR:DELETE-POINT.  But what does EDITOR:DELETE-POINT do?  And what
happens with a point that was created with, say, EDITOR:COPY-POINT and
is GC'd without explicitely deleting it?

Thanks,
Edi.