Summary Text scripts allow you to change the text displayed in the Title Bar at the top of a form.
The following example will change the Account form to display the last Document Log for the current Account. This might be used to easily track the steps taken so far in collection of a doubtful debt.
The template script code (click the Paste template Script code icon from the button strip at the bottom) includes sample code to change the Title bar using plain Text or XML which allows colour and bold text to be used.