E
Copies the Contraption Code from any selected Contraption to your clipboard. You can paste the Contraption Code into Notepad (or any other editor) to edit or save it.
If you edit your Contraption Code, you can apply it to one or more contraptions with I
Import from Clipboard, described below.
I
Applies any Contraption Code on your clipboard to any and all selected Contraptions.
You can apply code to multiple Contraptions if you have more than one selected. You can select more than one Contraption by holding down the shift key and clicking them, drawing a window around them, or selecting all Contraptions in your scene with S
Select... P
Contraptions.