The Map Button dialog can be accessed by right-clicking anywhere in the button bar and select the New Button… option.
The Map Button dialog allows you to associate an action (function and associated argument) with the button selected when accessing the dialog.
Action
This group contains the functions and arguments that make up a button action. A list and descriptions of the available functions is in the Table of Keymap Functions.
Function
Select the type of function that you want to assign to the specified button. You also need select the specific function details that the Function requires.
<Function details>
This entry box will change depending on the selected Function option. Select or enter the specific function that you want to assign to the specified button.
Label
Enter the text you want to appear as the label on the button.
Argument
This entry box appears if you select Run Script in the Function box above. Enter argument (or arguments) needed for your selected script. These script arguments function in the same manner as if they were passed in using the command line /ARG option.