Password "wrong" or irretrievable when using Screen Sharing

Strangely, I tried using Screen Sharing on the finder to access my iMac from my Macbook today and was asked to enter my password. I presume that this is my system password that I use to log in to my computer. It is the same for both. However, no dice...
Furthermore, I can't find this password in Keychain...also to no avail. I have no idea how to get things right so that I can access Screen Sharing.
Thanks in advance for any ideas you may have.

Start with Finder->Help->Mac Help->search for *Screen Sharing* and peruse the many hits.

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