Is it possible to automatically eject CD before dialog
Available variables are:
but I think $prescript is run after dialog, am I wrong?
The prescript is executed _after_ the last dialog box is displayed, and
just before udpcast (sender or receiver) itself is started
Post is after the udpcast.
Technically, the dialog is still running when pre is called, because the
dialog actually calls udpcast as a child process.