A mechanism consists of sets of reactions, reaction classes and molecules. within the mechanism window, by double clicking, these objects can be displayed. In the tabular form, the mechanism is ordered according to reaction classes. Double clicking on the reaction class displays it in graphical form. Under the reaction classes are the specific reactions of that class. Under each reaction is the set of products and reactants comprising that reaction. Double clicking on the molecule displays the molecule.
In the graphical form, the mechanism is viewed (initially) as the progression of reactions and molecules starting from the initial seed molecule. The levels of nodes alternate between molecules and the reactions (or reaction classes) that consume or produce them. The molecules are connected to the reactions (or reaction classes) in which they are involved. The connection coming into a reaction (reaction class) are the reactants and going out are the products. In the tree form, basically the reactants are connected to the top of the reaction and products are coming out from below.