Before we tell you all the cool things Visio can do (and what you can do with it), we should point out that there are two editions of Visio 2003: Visio Standard 2003 and Visio Professional 2003. Each edition is specifically designed to address the needs of certain customers.
With Visio Standard, you can create business-related diagrams such as flowcharts, organization charts, and project scheduling diagrams.
Visio Professional goes a step further into more technical areas. It contains all of what the standard edition has, plus features that let you create building plans, network diagrams, software diagrams, Web diagrams, engineering diagrams, and other technical diagrams.
Which version do you have? You can check by starting Visio and then clicking About Visio on the Help menu.