There are 78 keys.
Yes you can connect your wireless and USB iMac keyboard to PC or other iMac's. If you want to know how there are some videos on YouTube to help you do this.
Older iMacs use a USB keyboard which plugs into a USB socket on the back. Some newer iMacs use a Bluetooth wireless keyboard. These need to be turned on by the switch at the right hand end. A light indicates if the keyboard is working. If the light flashes it means that the keyboard has not yet connected to the computer. (See links below)
First off the keyboard must be a Bluetooth keyboard such as an Apple Buletooth keyboard. Secondly you must have Bluetooth turned on and it must be discoverable. To turn it on and make it discoverable click System Preferences in the Dock and then choose Bluetooth from the screen that comes up. There you will see ON & Discoverable. Click each box and then close out the screen. Turn on your Bluetooth keyboard and it will pair with your iMac.
Yes you can with a Bluetooth connection device you will have to buy. Reason being is that your G5 does not have Bluetooth built in. The Magic Mouse works off Bluetooth. You will love the Magic Mouse once you get the Bluetooth device and pair it with your mouse.
The wireless keyboard is not backlit that comes with an iMac but you can buy a backlit keyboard.
There is no card reader on the iMac. If your cell phone has Bluetooth you can download the photos via Bluetooth. Make sure the Bluetooth is turned on your iMac. To do this open system preferences then click Bluetooth. Make sure it is turned on and discoverable. Also make sure your Bluetooth is turned on your cell phone. You can now send the photos from your cell phone to your iMac via Bluetooth.
yes well the desktops do the laptops don't a keyboard for a mac is us$79 and the mouse the same i personaly don't like the new key board it doesn't make a solid ticking noise.
Alt is Option on the Mac keyboard.
There is none on the keyboard.
Use bluetooth to connect them. Both are bluetooth ready.
Ensure that Bluetooth is On in the Bluetooth section of System Preferences. In the Mouse section of System Preferences click on the Set Up Bluetooth mouse button in the bottom right corner. If the mouse is switched on (small switch underneath - green light should be on) the iMac should discover the mouse.
Export them from your Droid phone to your iMac using Bluetooth. It must be turned on both devices.