| Blog | # of Comments |
|---|---|
| The Unofficial Apple Weblog (TUAW) | 33 Comments |
| Engadget | 5 Comments |

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Let's try that again, with manual ampersand-lt-semi-colon type-stuff...
To clarify the behaviour:
<Enter> always invokes the default action (all-blue button)
<Space> invokes the highlighted action (blue halo)
<Tab>,<Shift-Tab> moves the highlight.
First letter often invokes a button. The behaviour here may be inconsistent from one app to another. I most often use it in iTunes, where <Del>, <R> ,<M> invokes "Delete", "Remove from Library", "Move to Trash".
No Command key required. Maybe other apps do need the Command key as Darren said.
Yes/No, OK/Cancel type dialogs often have one button set as the default action and the other one initially highlighted, meaning you can invoke either with a single <Enter> or <Space> - no need to tab around first.