"Precache" is an applet which does what its name implies assuming that the web browser being used by the client supports caching. The applet simply requests a series of images specified as parameters. The applet does not show these images, but if a web page subsequently refers to them, they would be already downloaded and stored locally. The down side here is that you're doing things in the background which the user might not want (they might have a slow connection, whatever...). Typically, this applet can come in handy when you want to do a web-based presentation.
For an example, more info, and a link to download the class file, go here.
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