I've written a similar system, but for Unix boxes only. What I did was to make the main Unix build script a process group leader and record this process group locally (i.e. on the "build driver" machine) in a "build state" file when starting the build script remotely from the build driver machine.

With that done, to kill the build on any Unix box from the build driver machine, I simply look up the process group of the build script from the local "build state" file and issue a remote command to kill that process group (i.e. kill -process-group-id), which will kill all build processes started from the main build script. As a precaution, after looking up the process group id, I do a remote "ps" command to list the processes belonging to that process group and prompt for confirmation before killing.

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