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The syntax you need is:
refServiceHandle(`getOptionRef;uniqueOpts)
This will pass the local variable down to the remote function as a parameter.
I’ve added a pull request to have this documented better:
https://github.com/KxSystems/docs/pull/85
Q for Mortals has some notes already:
https://code.kx.com/q4m3/1_Q_Shock_and_Awe/#119-interprocess-communication-101