30. A computer system comprising: an operating system responsive to one or more system calls each causing said operating system to process user inputs in a predetermined manner; a graphical user interface configured to generate one or more dialog box control requests in response to user inputs provided on said graphical user interface; a plurality of dialogs each constructed and arranged to control display of and interactivity with an associated dialog box open on said graphical user interface in response to one or more of said dialog box control requests; and a dialog box control system, operatively interposed between said graphical user interface and said operating system, responsive to a selected one of a plurality of dialog launch modalities, said dialog box control system constructed and arranged to close open dialog boxes not having a predetermined relationship with said selected dialog box and to control providing said one or more operating system calls and to control providing said dialog box control requests generated by said graphical user interface to said plurality of dialogs to provide an associated degree of display clarity and an extent of system interactivity associated with said selected dialog box modality.
30. A computer system comprising: an operating system responsive to one or more system calls each causing said operating system to process user inputs in a predetermined manner; a graphical user interface configured to generate one or more dialog box control requests in response to user inputs provided on said graphical user interface; a plurality of dialogs each constructed and arranged to control display of and interactivity with an associated dialog box open on said graphical user interface in response to one or more of said dialog box control requests; and a dialog box control system, operatively interposed between said graphical user interface and said operating system, responsive to a selected one of a plurality of dialog launch modalities, said dialog box control system constructed and arranged to close open dialog boxes not having a predetermined relationship with said selected dialog box and to control providing said one or more operating system calls and to control providing said dialog box control requests generated by said graphical user interface to said plurality of dialogs to provide an associated degree of display clarity and an extent of system interactivity associated with said selected dialog box modality. 35. The computer system of claim 30, wherein each of said plurality of dialogs comprises: a display controller constructed and arranged to control display of and interactivity with said associated dialog box on said graphical user interface; and a command processor constructed and arranged to direct dialog box control requests received from said graphical user interface to said dialog box control system and to forward dialog box requests received from the dialog box control system to said display controller, wherein each said display controller controls said associated dialog box in accordance with said received dialog box requests.