A key sequence on the Macintosh which simulates pressing the Programmer's Button for those who don't have programmer's switches. Generates Interrupt 7, dropping the user into the debugger, generally MacsBug, should it be present. If it is not, the user is dropped into MicroBug, the debugger built into the ROM. People with Apple Pro Keyboards will notice that they don't have a power key — but do not fear! These people can use command-eject with the same results!