The Clip Art Collection Options dialog, accessible from the icon on the Select Clip Art dialog, allows you to customize the caching settings for BarTender's clip art gallery. Whenever you search for a clip art image, BarTender has the ability to store (or cache) the search results, so that you can quickly access the graphic(s) for future use.
Cache Storage
Total Cache Size: Defines the amount of space BarTender reserves on your system for cached graphics.
Flush Cache: Allows you to manually clear BarTender's clip art cache storage.