We want to be able to launch the X appian instance from the Y so that the details can be passed by the system.
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Is the question that you want to launch a start form on another Appian instance?
The only way to do this would be an API request that would return you a URL to a Task Form. It would be 2 steps though (1 for the button and then you would have to click on the URL).
Mathieu Drouin said:another Appian instance
For some reason I assumed OP was referring to process instances, but good point. More detail definitely required here.