| http://www.w3.org/ns/prov#value | - To reach the second layer, the user must toggle the taskbar 220, i.e., not all of the buttons are visible simultaneously on the GUI. As the power of computers and number of interesting applications, documents and other objects increases, it is anticipated that users will wish to have ready access to a growing number of objects and, therefore, will find the approach depicted in FIG. 2 to be annoyin
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