Using Actrix:

1. Load Autodesk Actrix 2000 either by the icon or 
   Start/Programs

2. Open a new drawing of type Block Diagram.axt

3. A catalog has shapes pertaining to specific applications. 
   Add catalogs via File/Catalog/Open. Connectors and Block 
   Diagram have the shapes you need and are already included
   in Block Diagram.

4. The dropdown box at the top of the current catalog 
   lists those that are loaded. Select the one you want.

5. Drag a shape from the catalog onto your diagram. It can be 
   moved and resized.

6. Connect two shapes with the line in the Connector catalog. 
   If you get an end close to the shape it will lock on.

7. When you want to save in a form to import into another 
   document, select File/Save As.

Even better: In Help, go to the Users Guide Chapter 2.