Customizable user interfaces for programmed computer systems

A programmed computer system having a user interface that optionally includes custom buttons for initiating predetermined actions when triggered by a user;

• said buttons being embodied in electronic documents as hidden persistent character string defined button attributes associated with human interpretable elements of such documents;
• the button attribute of each of said buttons specifying a button class, button data, a command handler, and any desired user feedback;
• said system comprising
• at least one document editor for loading user selected ones of said documents into said system, such that said editor constructs a data structure for each of said user selected documents, whereby the button attributes for any buttons embodied in any of said selected documents are instantiated in the editor constructed data structure for said document as components of their associated document elements;
• said editor having a user settable input redirection switch for selectively operating said editor in a buttons-on mode and a buttons-off mode;
• at least one class-specific button handler for a specifiable button class, each button handler containing a list of commands for a predetermined button class;
• a plurality of specifiable command handlers for executing the commands provided by said button handler;
• and
• a centralized kernel for parsing the button attributes of each button that is triggered by said user and in so parsing to identify the specified button class of said button and the specified command handler for said button;
• said kernel providing communication paths between said editor, the button handler for the specified button class of said button, and the specified command handler for said button to carry out the action and feedback that are called for by said button.