What does it actually do?

The capabilities of GAIA fall roughly into three areas; those of an image display tool, those provided for the analysis of images and those for querying on-line resources (catalogues of images and data). Each of these areas is described very briefly in the next sections. As with most graphical tools, probably the best way to find out about GAIA is to explore it interactively. Failing that many windows have a one-page description in the on-line help system and most graphical elements (buttons, entry fields etc.) have one-line descriptions that appear in the short-help region at the bottom of windows.

Windows that provide a limited range of controls for some kind of focussed task are called `toolboxes'. In general what they do should be obvious or they are really front-ends for other software packages. Good examples of this latter type are the photometry and object detection toolboxes. When such a toolbox is used the documentation for the command-line tools is the primary source for finding out what is going on under the bonnet.