Execute external program and wait while finished

I'd need a function that allows me to execute an external software (like the existing @execute-command), but with the addition that Repetier waits until that software has finished (for example some image processing) and not printing meanwhile.
It would be perfect if I could check the return of that software (e.g. -1 or 1) to terminate the print if something went wrong.

An alternative would be a possibility to pause the print using @pause, and proceed with the print after a trigger from an external program (without clicking that pause-dialog)


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