http://www.cogsci.ed.ac.uk/~ceilidh/SAC-Author.cgi/form?paper=NNNwhere NNN is the number of the paper.
Click on this link!
You may also want to make a note of this URL, so that you can come back and edit your paper's page again in the future.
If you have the paper in more than one form (e.g. HTML and postscript), you should create a small page which identifies and links to the alternative formats, and then give the URL of that page.
Note that if you do have a version of the paper on a Web server, you must be sure to include the ACM copyright notice in your document. You should also ensure that the paper mentions that it was presented at SAC'98, and points back to the conference page at http://www.acm.org/conferences/sac/sac98/
The page to which you (will) have added your abstract is in fact the "index" page for an interactive discussion, managed by Ceilidh, a software system developed by Lilokoi Software.
It is also possible for anyone to post a comment on a paper: simply follow the "make a public comment" link on the paper's index page, and you will given a form on which to submit your comment. Note, though, that you will be asked to first register yourself with Ceilidh, so that we can keep track of who is making comments. Once you have done this, you will be able to post and respond to comments on all of the papers, and even configure Ceilidh to email you each time anyone comments on any of the papers. Note that there is also a link on every paper's index page that will allow you to without posting a comment.
I trust that this makes sense, and hope that you will take 5 minutes to help make the conference proceedings that tiny bit more useful to everyone...