In isle of the wind in the tarus cave level there is a place where you have to push two blocks to open a door, how do you create this type of screen/ trigger.
Trigger Madness!... not really
There are flags you can position to create this effect. The flag you are looking for is the block trigger flag, #66. When ever you use them, you have to have the blocks on top of all of the these spots in order for the stairs to appear or the shutter to open. Hence you have more than one block to push in order to open a door.
I found a good example of this in ganon's return. In level 1 you have to push 4 blocks onto 4 buttons to open the shutters.