Function Browser, Variable Dialog box

You can click the Functions button in the Variable dialog box to display the Function Browser.

You can use formulas (which can be composed of functions) as part of your definition of a variable. Use the buttons to move backward and forward through selections.

You can also copy your current selection to the Clipboard using the button.
Option Description
Category This box contains a list of available categories of functions. You can select the desired category to view specific functions within that category in the Item frame.
Item This box contains a list of functions within the selected Category.
Info box This box displays the current function's name, parameters, return value, and description. The formula you create is applied to a single variable.

For further description of the selected item, look at the description box at the bottom of this dialog box.