dca603d2_MacInfo___Efficiency__What_to_do
[Task] Click "OK" in a dialog box [Example] you have typed in several fields and now want to click the "OK" button. [What to do] 
press the Enter key. This avoids that you have to leave the keyboard, move the mouse over the "OK" button and click it. Sometimes the return key also works, but Enter is the correct choice.
MacInfo - Efficiency
What to do