I want to be able to see what is going on with my iMac at home while I'm on my iMac at work. I don't want to person on my iMac at home knowing I'm watching the computer. Is this possible?
Sounds like you want VNC. Look at Chicken of the VNC.
Chicken of the VNC is a great
client but isn't a server... It also doesn't play very nicely with Apple's Remote Desktop (which is built off VNC). I suggest installing Vine Server on your home machine; It doesn't leave an icon in the dock so someone at home won't know it's running unless they're paranoid enough to look at the process list.
Then use Chicken of the VNC from work (or any VNC client if you're on Windows or Linux) to connect to your home machine. Your mouse movements may tip off anyone on the home machine unless you select a "View Only" option.
And finally, ensure you have the correct ports open; 5900 if you connect directly, but I would suggest you only open port 22 (SSH) and tunnel all your VNC traffic over SSH. Let us know your work machine configuration and I can suggest a way to tunnel appropriately. On a Mac:
0) Install Vine Server on your home machine.
1) Turn on SSH on your home machine. Preferences -> Sharing -> Remote Login
2) Ensure your router port forwards SSH to your home machine. Refer to your router setup or instructions.
3) From your work machine, assuming it too is a Mac, from the terminal:
ssh public.home.ip.address -L 5900
rivate.home.ip.address:5900
4) Now you're ssh'd home with a secure tunnel.
5) Fire up CotVNC and connect to "localhost".
Good Luck and Good Spyin'!
