Field Track uses a button called "Use" extensively throughout the program. "Use" can be used to indicate you wish to use the currently selected product.
Where ever you see the "Use" button it allows you to use the currently selected entry in your records.
Some "Use" functions are quite extensive. For example the "Weather Scale" function checks if you have a wind direction and an exact wind speed entry before compiling the correct information to return to your records.
Some display lists also either use a double-click to provide a "Use" function, or an editing ability.