Controlling a momentary switch with an on off switch

Using Arduino General Electronics
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I have a controller which has a momentary tactile switch to turn it on and off. I need to create an interlock so that some other 240V items come on when the controller momentary switch is turned on. Is this possible? I have used contactors in the past for this but the items being turned on were fitted with simple on and off switches. I know there might be an issue with the circuit knowing what state the controller is in via the momentary switch. But the only other option is the reverse engineer the controller to find out what is going on but as it's only joined to the main PCB its more that likely using a digital interface which will require some substantial understanding as its Chinese I'm not hopeful.

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I am not sure that I understand the question, but if you wish to take an action only when the momentary switch is closed (pressed), use the state change detection method. See also my state change detection for active low inputs tutorial.

As @LarryD asks, Please read the forum guidelines.
Use the IDE autoformat tool (ctrl-t or Tools, Auto format) before posting code in a code block.

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Absolutely. Can you remove the switch and wre relay contacs across it, then activate the controlloer (whose state you dont know) from an arduino that DOES know what the state is (or should be)?

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