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plug-in a supplementary software application that adds enhanced functionality to a computer program. [1/2 definitions]
toolbar one or more rows of buttons on a computer display, each of which can be clicked to select a particular functionality in a software application or web browser.
widget in computing, an application or program that performs the limited function of giving easy access to specific types of information or functionality. A widget often floats on top of a web page that is already opened. [1/2 definitions]