XThreads input value into global user value

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I'm not sure what exactly do you want to achieve.

Here is a basic explanation so you can decide whether it is possible or not:

1. You create thread A with value X for mykey thread field.
2. You create thread B with value y for mykey thread field.

Whenever you view the thread A, by default, the mykey value is always x.
Whenever you view the thread B, by default, the mykey value is always y.