Has somebody made a surveillance thread which doesn't die?

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I have a log-in window application. When the user presses the cancel button
it kills another window by it's name and then it exits. The problem is that
if somebody kills the log-in window by terminating the process in the task
manager the other window is not killed.

One solution might be to have a surveillande thread which doesn't die when
the mother-thread dies, and can't be killed in the task manager. As soon as
the log-in window thread stops responding to surveillance messages it will
kill the other window and then exit.

Is this possible?

I've also tried to have a form which spawns another form, but in the Task
Manager there is only one entry (PasswordDialog.exe). If you kill this
process everything dies and the window which I want to kill when the log-in
window dies is not killed.

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