How do you control alt delete on a mac?

My MacBook air has frozen when using keynote for a presentation. Usually on a PC I would do ctrl alt delete to end that program. How do you do that on a mac? Pressing esc doesn't help. The only thing that works in holding down the power switch and rebooting but that surely cannot be the solution? Help!

"Force quit".
You can get there by pressing option-command-escape.
Or via the Apple Menu.
Or via the various "Stop" commands in Activity Monitor (in your Utilities folder).
Or by clicking and holding on the dock icon of a hung-up process, or pressing option while clicking and holding on a dock icon of a normal process.
There are other things, too, e.g., Terminal commands, but the above usually suffice.
charlie

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