16. The method of claim 1 wherein the first operation has at least two input arguments, the method further comprising: presenting on the display a label associated with the first operation, the label indicating a mapping of the input data to the at least two input arguments of the first operation.
17. The method of claim 16 further comprising: presenting on the display a control icon associated with the first operation; and altering, in response to the user selecting the control icon, the mapping of the input data to the at least two input arguments of the first operation.