The left function cluster replaced the chord set of Engelbart's NLS and the Alto, while retaining the same two-handed style of operation: mouse on the right to

The left function cluster replaced the chord set of Engelbart's NLS and the Alto, while retaining the same two-handed style of operation: mouse on the right to select the object, keys on the left to select the operation. Worth also noting that Star didn't use the Clipboard Cut/Copy/Paste (fragile invisible state) model, which I think came from Larry Tesler and certainly was popularized by the Macintosh. Instead it had the two operations MOVE, which moved the current selection to the target location, and COPY, which duplicated the current selection at the target location.