The tree used for navigating options. Clicking on the option causes it to be displayed in the Option Pane (3). Each entry in the tree had the form [option name]``[option flag]''.
Each option may have one of three colors, indicating its status. Red = option is required, value not yet specified; Black = option required, value not yet specified; Blue = option has a set value and will be used if the program is run. Thus, an option may go from Red to Blue or Black to Blue when it is set to a value.