I can answer this one because the command was added for me when I worked on a small TGC project last year
RunApp
Runs an external executable that is independent of this app. It will return an ID that you can use to check if the app is still running or in extreme cases to terminate the app. If this fails it will return 0. Currently only works on Windows.
Definition
integer RunApp( szFilename, szParameters )
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Quidquid latine dictum sit, altum sonatur
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