In the upper right corner of your RTM screen, you'll seen a small blue box with a magnifying glass in it. You enter the query data there. Immediately below it is "Show Search Options" . Click on that and it will bring up a more detailed Search box where you can enter all kinds of search data on various fields.

In the lower right corner of the Search Options box it says "More advanced search options available". Click on that and it will bring up a detailed list of many of the search options available. You can do full Boolean searches using these terms. There are a few tricks along the way, but you can get help in these forums if needed.

Best of luck!

I suspect this is what you are after:

http://www.rememberthemilk.com/help/answers/smartlists/whatare.rtm

It's very powerful, and (to me) the heart of RTM.

Please keep asking questions; there's lots of help to be found on these boards.

Totally agree with ranbarton about the power of Smart Lists; I have as many Smart Lists as regular lists (and would probably tip the scales more if not for the way my BlackBerry synchronizes).

Good luck! :)

Definitely> I've only had RTM for a week, and I have 5 regular lists and 11 Smart Lists.

agreed. Smartlists are the bee's knees.