See the Command Editor page for a description of the elements which the Simple and Advanced modes have in common. This page only covers things unique to the Simple mode.

In the Command Editor's Simple mode (shown above), the Function field is only a single line. In this mode you can specify the function (what the button actually does when you click it) in three different ways:

This would launch Notepad, passing it the name of the first selected file in the file display.

When you select an external program to run, the Start in and Run fields will be enabled.

Click the Advanced button to switch to Advanced mode.