Check whether existing batch running
Scenario 1
1) user runs testrunner.bat using command line. It takes 5 hours for the testing to complete
2) task scheduler starts a new instance of testrunner.bat
will testrunner.bat crash? ...
As far as I understand, each time you run testrunner.bat it effectively runs as a separate independent instance. I do not believe that it will "detect" running instance and do anything different.
One important thing to note is that you may hit a license limit. We run our Jenkins server with a named user license and we have to throttle our builds to max two concurrent. If you try to run a third concurrent build (a third testrunner instance) it fails with an exceeded license error.
