next, previous Section / Table of Contents / Index In the following sessions you will learn how to use BALSAC to generate, display, and analyze the most general atom structures. BALSAC allows you to enter basically two different interactive sessions, BALSAC/LATTICE where periodic systems of atoms (crystals, surfaces) can be studied and BALSAC/CLUSTER where finite clusters of atoms (molecules, clusters) can be examined. The sessions use similarly structured option menus and building strategies so that you can easily switch between them. However, to show you the special features of each session we will discuss them below in two separate examples. In Sec. 3.3.1 you learn in a BALSAC/LATTICE session about the (001) surface of the cubic Zincblende lattice which is still simple enough to understand all numerical and graphical output but can also be used to illustrate some of the more advanced features of BALSAC/LATTICE. In Sec. 3.3.2 you examine in a BALSAC/CLUSTER session the nickel carbonyl molecule, Ni(CO)4, which shows both basic and advanced features of BALSAC/CLUSTER. next, previous Section / Table of Contents / Index