4. A method of selectively desired data sets as claimed in claim 1 wherein one categorical list-and the associated group of data sets represents a control list and each data set therein represents a control command.
6. A method of selectively desired data sets as claimed in claim 4 wherein one control command is a modify selection command and the method further includes changing a displayed and selected data set of one category to a new data set based upon the application of said select control when the data set representing said modify selection command is displayed and selected via said scrolling control and said select control and based upon the application of said select control and said scrolling control to display and select said new data set from said one category.