Controlling multiple outputs whit the same ground.

hi, im doing project controlling microwave whit arduino yun via wifi. thing microwave have 4 commons point combines whit other points write number on screen. can arduino yun use differents outputs pin whit same ground though there same output pins on inputs pins of microwave? if not can combine 2 outputs pins send siganl , how can controll on wifi via bridge. or suggestions appreciate. thanks

is microwave oven? can give details of make , model? , perhaps diagram of wiring referring to?

...r

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