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Canceling mercurial tasks in the IDE appears to work, but the hg.exe process continues to run. Under Unix the canceling invokes Process.destroy which kills the invoked python shell and hg command cleanly. Under Windows there is no parent child process relationship and so canceling the shell that invoked the command does not kill the Hg.exe process. http://bugs.sun.com/view_bug.do?bug_id=4770092