In many places, like reports and the person lookup tool, hitting the Enter key is the same thing as hitting the most prominent/obvious button on screen. In these cases, it’s the same as hitting the Search and Print buttons, respectively.
You can also use the Tab key to move quickly between fields. In the person lookup tool, your cursor ends up by default in the field for the person’s family name. Type in that value, then hit Tab to go to the first name field, enter that, then hit Enter to search, all with your hands never leaving the keyboard.