On using computers to help w/ grammar, I tried. I and others looked at about 10 programs and found them of little help. A grad student looked at one of the better ones (so we thought)--Perfect Copy--and did a thesis investigating how it was used. We found that the silly thing was often downright incorrect in detecting errors and telling students how to use punctuation. When we called the company and quoted several handbooks, they simply said that nobody else has complained. larry beason