What is the difference between pass by value and pass by reference in case of parent-child process model?

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Robert Shankin · Answer

I like jose's reponse - but I'd like to add more color, if that's ok: 
 Think of byref as storing a pointer to a value, rather than a static value. When the value is read in either place, the system uses the pointer to get the singular value that's used in 2 places. If the value is changed in either place, the system follows the pointer to change that singular value for use in 2 places. 
 This is valuable when you have a use case in which a particular value needs to be in sync across 2 processes. Truthfully, the way we design lately, byref variables aren't used that much. But, there are valid use cases. A good rule of thumb is to not check that box unless you are certain the functionality is required.

mudit · Answer

This is what you are looking for. 
 https://docs.appian.com/suite/help/19.3/Sub-Process_Activity.html#passing-a-process-variable-as-a-reference

What is the difference between pass by value and pass by reference in case of parent-child process model?

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