Load Model - allows you to select a model from a list of valid Vensim models.  The Vensim Model Reader is loaded by default with intro.vmf, which allows you to simulate and analyze a model without loading one.

Review Model Structure - moves you to a screen which allows you to look at the physical structure of the model, and to print or export to the clipboard.

Simulate the Model - moves you to the Scenario Setup screen in preparation for performing a simulation run.

Analyze Simulation Results - moves you to the Analysis Control screen, which allows you to analyze model structure and analyze the results of simulations (datasets, or runs).

Find out More About Vensim - runs through a demonstration of some of Vensim's features and capabilties.