viewing imac on apple tv

i have an imac in the other room that i would like to be able to view on the apple tv. on the mac i have control software that i can control the imacs mouse and keyboard with my itouch. it would be nice to be able to access the imacs screen (screen share) and be able to view it through my apple tv and on the tv like a monitor. is this possible? if so can you tell me how? im new to all this. thanks. im currently running the newest software on my apple tv with atv flash and connected is a hard drive so i did the plug in and patches.