10. A tactile computer interface comprising: a tactile mouse having at least one tactile display and at least one command input control; and a software system of executable computer program code which, when executed by at least one processor in communication with computer display data and said tactile mouse, is configured to provide a tactile control interface having a selectable navigation mode enabling a blind user to navigate between graphical user interface (GUI) objects represented by said computer display data, said software system comprising: extraction, analysis and transformation code configured to extract, analyze and transform said display data into a new hierarchical structure of GUI-related data elements representing the structure of GUI-related elements therewithin; tactile viewing code configured to display at least one of said GUI-related structural data elements on said tactile display as part of said new hierarchical structure; and navigation code configured to permit efficient selection of a different GUI-related element within said GUI structural data elements of said new hierarchical structure by selecting one of plural predetermined navigational modes for assisting movements of the tactile mouse in relative directions within said new hierarchical structure to select a desired different GUI-related element, said navigation modes including: a. a spatial navigation mode wherein movements from one GUI object to another are directly controlled by spatial movements of the tactile mouse wherein the user is enabled to freely move a fiducial element along a desired path; b. a contextual navigation mode wherein movements from one GUI object to another are controlled based upon contextual descriptors of a target GUI object wherein the user is enabled to jump a fiducial element to a new location in response to a predetermined user input; and c. a spatial-contextual navigation mode wherein a virtual guide trajectory is created in computer memory between displayed GUI objects and wherein said virtual guide trajectory is employed to aid user-controlled spatial movements of the tactile mouse wherein the user is guided to move a fiducial element along the virtual guide trajectory.
10. A tactile computer interface comprising: a tactile mouse having at least one tactile display and at least one command input control; and a software system of executable computer program code which, when executed by at least one processor in communication with computer display data and said tactile mouse, is configured to provide a tactile control interface having a selectable navigation mode enabling a blind user to navigate between graphical user interface (GUI) objects represented by said computer display data, said software system comprising: extraction, analysis and transformation code configured to extract, analyze and transform said display data into a new hierarchical structure of GUI-related data elements representing the structure of GUI-related elements therewithin; tactile viewing code configured to display at least one of said GUI-related structural data elements on said tactile display as part of said new hierarchical structure; and navigation code configured to permit efficient selection of a different GUI-related element within said GUI structural data elements of said new hierarchical structure by selecting one of plural predetermined navigational modes for assisting movements of the tactile mouse in relative directions within said new hierarchical structure to select a desired different GUI-related element, said navigation modes including: a. a spatial navigation mode wherein movements from one GUI object to another are directly controlled by spatial movements of the tactile mouse wherein the user is enabled to freely move a fiducial element along a desired path; b. a contextual navigation mode wherein movements from one GUI object to another are controlled based upon contextual descriptors of a target GUI object wherein the user is enabled to jump a fiducial element to a new location in response to a predetermined user input; and c. a spatial-contextual navigation mode wherein a virtual guide trajectory is created in computer memory between displayed GUI objects and wherein said virtual guide trajectory is employed to aid user-controlled spatial movements of the tactile mouse wherein the user is guided to move a fiducial element along the virtual guide trajectory. 11. The tactile computer interface of claim 10 , wherein: said navigation code is configured to permit efficient jump-selection of a different GUI-related element within said new hierarchical structural data elements by separated incremental movements of the tactile mouse in one or more relative directions corresponding to said new hierarchical structure to effect a respectively corresponding jump to a desired different GUI-related element.