Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can you use this with an Emac & can I use it with my 2010 21 inch Imac ? My gf has my old Emac & I can't afford to get her a newer Mac yet and I need a second monitor to see what I'm typing or posting better.Next year I will FINALLY get my 60 inch tv and will use that as my Imac monitor !
Document: I recently bought this monitor for use with my 12 inch Powerbook G4. What an incredible combination! The Cinema Display offers unbelievable clarity, brightness, and "crispness." The Powerbook drives it with no difficulty. The Display slides around very smoothly on the desk, so I can move it out of the way when I'm not using it. Expensive, yes, but if you are using your Mac for making money, it is well worth it in improved productivity!
Even though there are some other displays on the market that use the same LCD screen and are sold cheaper, I still really like my Apple display. I've had it for almost a year and it looks very pleasing. The rounded aluminum edges on the top and bottom of the display have a feeling of disappearance, so it sort of blends into the environment. And when you're watching a movie or just typing something (like an amazon review) you just see the screen and not the display itself.
With a second monitor, the iMac becomes much more useful, plus more USB and Firewire ports, what's the downside? I have one of these on both of my iMacs, one from when Apple made them, and one bought used through Amazon. Be careful what you order! You will need a power supply specific to the Display and power cord! Not all sellers include those items! Plus for the iMac (at least my iMacs) you will need a Mini-DVI to DVI-D adapter.
I'm both surprised and delighted to say I don't miss my old monitor at all. Colors are rendered beautifully and I have plenty of real estate within which to work in Photoshop. I have space for palettes as well as a good size version of an image. I can't comment on reduced eye strain, but I'm happy to know there is no flicker in this screen and I have an unquantifiable sense that my eyes are more relaxed after a few hours in front of this beauty.
This allows the connectivity from the monitor itself.If you wish to use this monitor into a newer computer which uses HDMI, you will need a DVI (female) to DVI male converter. The part of the cord which connects to the computer is not removable like many others.I have only had this monitor for a short time, but so far I can say it looks brilliant! I am so surprised. I had no idea monitors could be this good.
There was a time that I never considered buying an Apple display. I figured a Mac costs enough money, without spending $1000, or more, on a display. In late January 2005, I purchased the newest Powerbook G4 12 inch 1.5 GHZ G4, with superdrive. The notebook had nearly all the performance I was looking for, and the small form factor allows me to easily haul it around the house, or the world should I ever get to travel properly.
Also, the only hard button controls you get are brightness and contrast. No other screen adjustments with the PC. I haven't really need any since the display have proven to be very intelligent when resizing different screen res's and I can use the ATI drivers to adjust things like color temp and gamma.Other then that it is a fantastic display for the price.
when I bought my Intel iMac w/20" LCD suddenly everything else looked dull in comparison. This Apple 20" is very close in spec to my iMac 20" screen. Stores like Best Buy do not have good quality 20+" LCDs in yet. You want the 16x9 profile also, the regular square LCDs look dorky in comparison and typically have lower brightness and contrast ratios. The newer stuff is very bright and clear. It is obvious when you go to a store and look at the LCD screens.
I actually like this screen better than the one on my iMac and it seems just as bright even if the specs say that it is not. Amazon also boxes the shipment (besides the Apple box) so your screen should arrive undamaged.
The display quality of this monitor is unbeatable. I purchased a used Apple Cinema 20-inch Display to pair with my Apple MacBook Pro from Laptopmate. The produce arrived timely and very well packaged. The condition is like what's descripted and better than I imagined. I tried pair the MacBook Pro with a monitor from another brand name. But the result was rather disappointing.
Answer: Not sure what an Emac is.  I had a Mac mini that it was compatible with.  Usually, in my experience, macs are compatible  with other Mac products. I am almost positive it would be fine with a 2010 iMac. The Emac: not sure, but maybe you can google the question or ask apple themselves? Remember though. No camera or speakers.  I loved the screen though. I have never had a compatibility issue between macs...although I have had to download extra stuff to help them talk, in the case of my old Mac that was PRE-OSX. My seller included an extra cable that I didn't even need. I bought this screen on the premise that macs are compatible with other macs....and I was right, for my part.