1. In a computer system having a display screen, a user interface mechanism for hierarchical menu selections comprising: a zoned menu control window including a first zone displaying indicators representing a plurality of selection levels in a menu hierarchy, and a second zone having contents comprising a displayed list of selection options for one of said selection levels; means for entering an option selected from said displayed list of selection options; means for refreshing the contents of the second zone by replacing the displayed list of selection options with a second list of selection options for a different selection level in response to entry of an option selected from said displayed list of selection options; and registration means for implementing a computer task on selection of options for all selection levels in the menu hierarchy.