Basic Grid Analysis contains the functions that are core to most basic Digital Elevation Model (DEM) analyses, and provide inputs to many other functions. The general order in which they should be executed is top to bottom.
Network Analysis contains the functions required to delineate channel networks and subwatersheds. Again the sequence is top to bottom.
Specialized Grid Analysis contains more advanced functions that can be invoked as needed.
The section below on the functions and what they do below describes in detail how each function works. Generally each time a menu item is selected a dialog box appears showing the inputs and outputs for a particular function. Once a base DEM has been selected the file names for most inputs and outputs are populated following the default file naming convention. You are free to change these, but working with the defaults saves some typing. [A side effect of this, is that if a new base DEM is selected, all file names are reset back to their defaults.] Before running each function you should ensure that all necessary input information exists, or expect an error. Help on the individual files is available by clicking on the label to the left of the field where file names can be changed.