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In case of a failed run, Delft-FEWS attempts to terminate any child process afterwards. In order to be able to do this reliably, it is important to only create processes with a proper process tree. For instance, an unsupported option is to execute a Windows batch file starting executables in the background where the batch file terminates itself, leaving the child processes orphaned. This is illegal because Delft-FEWS cannot detect these as child processes and therefore not terminate the child processes. This will lead to model executables from dead taskruns to remain while possible locking files, blocking new runs with the same executable.