Below is a screenshot of the PSICAT application. Various areas on the image are highlighted. Each of these areas has a specific name and function which will be detailed below.

The workspace area contains the projects that you've been working on in PSICAT. Each project is a hierarchical tree of models. You can double-click on any model in the workspace to open it in an editor.
The properties area contains various property tabs for viewing and editing the properties of the currently selected model. When you select models in either the workspace or in the editor, the properties area will update to show you the properties of the selected model.
The viewer/editor area displays any diagrams you are currently viewing or editing. When you double click on a model in the workspace, it will open a new editor in the viewer/editor area. You may have multiple editors open at the same time. Each will show up as a separate tab and you may arrange them so you can view two editors side by side.
The palette is highlighted in yellow in the screenshot above. It is only available when an editor is open and is associated with a specific editor. The palette contains all of the tools that are available for working with the diagram open in the editor. The available tools will depend on whether the diagram is in view-only mode and on what columns are included in the diagram.
The PSICAT application layout can easily be customized to suit the user's preference. In general, each of the areas above can be resized and moved to different places in the application. For example, the workspace area can be dragged to the bottom of the application next to the properties area, the palette can be moved to the left side of the application, etc. If you would like to restore the original layout, use the Tools->Reset View menu option.