I'm not sure what you mean by
"emacs support for a language and want to display suggestions for the user in a pop up frame."
but it could be that if you add support for semantic (cedet.sf.net/semantic.shtml), even if you don't use the full parser architecture, you could use the popup tooltip like support built into that framework without having to figure out pixel positions. Cedet/Semantic tries to provide smart completions at idle time. If that's what you are looking to do, it may be a little easier, plus you would get a host of other useful features at the same time.
Here's a screenshot of what I have in mind:
http://www.monodevelop.com/images/screenshots/macosx.jpg
So I'd like to popup a small frame listing the possible completions. As the user types more characters, the list is narrowed down to show the remaining completions. If I go up/down in the list then a short description of the highlighted item is shown immediately in a tooltip. If the user presses F1 then he's taken to the complete documentation of the item (e.g. in a browser).
I don't think Semantic provides the framework for all this, but correct me if I'm wrong.
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