The 'apple key' is now the command key (cmd). There is one command key on either side of the space bar.
The iMac
There is no apple key on a newer iMac.
The iMac is an Apple computer.
Every application and window you open will have a help tab in the menu on the top left of the screen.
After adding a Magic Trackpad to your iMac you need to run Software Update (from the Apple menu - top left corner) which will add a Trackpad section to your System Preferences.
Click the Apple logo top left of the screen and from the drop down menu click Shut Down.
You do not make the iMac, Apple does.
The Apple iMac is a computer and its purpose is to compute.
One can read Apple iMac reviews online at various websites. One can read Apple iMac reviews online at websites such as CNET, TechRadar, and Computerworld.
I do not have a 24" iMac. I have a 20" iMac. Apple no longer sells the 24" iMac. If you will click the Apple logo on the top left of your screen and then click About This Mac then More Info you can find the answer.
Apple
Apple