Dockapps, or docked applications are computer programs which appear to reside inside an icon rather than a window in graphical computer systems, normally in a part of the user interface known as the dock. Their display is constantly updated just like a windowed application, but appears inside a small (64x64 pixel) icon.
This makes dockapps particularly suitable for monitoring things in the background, and some applications of dockapps are:
References
Dockapps Wikipedia(Text) CC BY-SA