about:config interface section of Mozilla Firefox version 2.0.0.14 and later versions; and in the bundle editor section of TextMate 1.5.7. This feature is also employed in application launchers such as Quicksilver 1.0.

Typically a list of matches is generated as the search query is typed, and the list is progressively narrowed to match the filter text.

Web search

In September 2010, Google introduced Google Instant,

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