<operating system> A common graphical user interface component,
consisting of a permanently visible row of button icons that, when clicked with
the mouse, cause the program to perform some action such as printing the current
document or changing the mode of operation.
The toolbar buttons often invoke functions accessible via menus but they are
easier to use since they are permanently visible. A typical use would be in a
paint program where the toolbar allows the users to select one of the various
painting "tools" - brush, pencil, bucket etc.
Some application programs under some operating systems may allow the user to
customise the functions accessible via toolbars; in others, the choice is fixed
by the programmer.
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