"Perhaps the cleverest idea was to equip mice with buttons. By being able to signal a request with the same hand that determines the cursor position, the user obtains the direct impression of issuing position-dependent requests. Various techniques have emerged in this connection, e.g. pop-up menus, pull-down-menus, etc. which are powerful even under the presence of a single button only." -- Niklaus Wirth #ux#ui#gui
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