Attempts to re-start result in one of the following:
a) An error message saying to use the Windows Task Manager to end any running NT processes and then to retry, or
b) An error message saying that NT must be re-installed.
NT re-installation is sometimes possible at that point, but usually Windows has to be re-booted before NT can be re-installed.
In all cases source code changes made before the F4 Key was pressed are lost.
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