You can search for clips based on one or more clip properties, and also apply a filter so that only those clips matching the filter condition are shown in a window.
A search or filter can have different types of conditions, all of which must be true for a clip to match:
When searching you can move forward to the next clip matching the conditions, or search for all clips in one go (all clips that match will be selected). You can also create a new view containing just the matching clips.
When a filter is in effect only the clips that match the filter are show. Press the filter button to toggle a filter on and off, or select a named filter to apply from the drop down list in the toolbar (Professional Edition only).
Grouping and Hiding clips are two other ways of excluding clips from being shown in a window, separate from and in addition to the regular filtering mechanism.
See the page on the enhanced query dialog for details of the query dialog available in the Professional Edition.