The pane on the right should change to put your cursor within the code for the MouseEnter subroutine. You typed the first few letters of an object and RB is about to finish typing the object's name for you. You can type something else if you want. Or, if the suggestion is correct and you want to have RB finish typing it for you, press the Tab key. Accessing Object Properties We've already seen Properties at work.
Properties can be settings for an object, but really they are just storage containers.
Translated into English, that means you have the object's name, a period, and then the property name. This is where you type. This is where you type.' into the 'text' property of the infoDisplay object. A string can contain numbers, but a number cannot contain letters. You tell REALbasic that something is a string by enclosing the phrase in double-quotes.