Biff,

Thanks for the guidelines / direction on the suggested websites.

Comicfly

"T. Valko" wrote:

See these:

http://mcgimpsey.com/excel/formulae/doubleneg.html

http://xldynamic.com/source/xld.SUMPRODUCT.html

Biff

"ComicFly" wrote in message
...
What is the name of this symbol and what is it do when placed in front of
a
function name. ie. --isnumber........

Thanks