By accepting an argument they directly give access to functions of web sites, as opposed to filling web forms at the respective web site for accessing these functions. Smart Bookmarks can be used for web searches, or access to data on web sites with uniformly structured web addresses, e.g. user profiles in a web forum.
As of 2007, they can now be used in most web browsers.
In Epiphany, Smart Bookmarks appear in a dropdown menu when entering text in the address bar. By selecting a Smart Bookmark the respective web site is accessed using the text as argument. Smart Bookmarks can also be added to the toolbar, together with their own textbox.
The same applies to Galeon, which also allows the user to collapse and expand the textboxes within the toolbar. In Kazehakase queries can be formulated either with a simple argument, or more flexibly using regular expressions.
Smart Bookmarks can also be shared, and there is a collection of them at the web site of the Galeon project.
Konqueror uses a seperate "Search"-box for smart bookmarks. You can add as many smart bookmarks you like to it's searchbox.
 See also