Now open the alias (or click the Dock icon).Make an alias of it (click and drag while holding Apple and Option) in the Applications folder. There is an application called Screen Sharing.From the other Mac, open /System/Library/Core Services/.Let's access the Lion computer from another Mac: If it still doesn't work, then you should try downgrading to ARD 3.4, but I don't think this is necessary. If you don't know what that last sentence means, leave Remote Management and remote Apple Events off. If you administer a bunch of computers with ARD, then turn Remote Managment on.

If you want Windows computers to access it, go to Screen Sharing > Computer Settings, click the VNC checkbox, and enter a VNC password.

If you just want to access your computer through VNC or screen sharing, just turn on Screen Sharing. We have just 'kickstarted' those services.

Now turn ON Screen Sharing, Remote Login, Remote Management, and Remote Apple Events.

Turn OFF Screen Sharing, Remote Login, Remote Management, and Remote Apple Events (just turn everything off).

You can skip all the other threads and just read this. How to fix VNC, Apple Remote Desktop (ARD), and screen sharing in OS X 10.7 Lion.

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