Multi User Screen Sharing

I recently bought a mac mini to replace Win 8 file server and have a question about screen sharing. I have created 2 users one is the main account which i guess is an admin and 1 user as a standard user. If i log into mini as the Main User then screen sharing from remote computer just logs into this account(mirror of the mini) however if i log into mini as stardard user or secondary user then i get an option share display or Log in as the main user. Is there a way i can force this option or behavior if i log into mini as the main user. ie i would like to have mini boot into admin automatically and then be able to log in as a user from a remote computer not affecting the monitor of the main computer. Is this possible?
Thanks,
Matt

Thanks for the link but I had already read that. Problem is that when logged into macmini(computer I want to log into from remote machine) as user a when I try to log in from imac it automatically logs in as user a in screen sharing mode! No option to choose log in as user B or a dialog to choose that option.... It simply starts in screen sharing mode. I have preferences set to allow all users on macmini. If I log in as user b on Mac mini then I have the option to choose to log in as user a which is opposite what I am trying to do. How can I change this behavior?
Thanks again.

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Colt,
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Originally Posted by wpolster
Hi!
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User A has a shared calendar (the owner of this shared calendar is User
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