Behalf Of Tom Brinkman Sounds very powerful. Is there any additional web information to help me incorporate these ideas.

Not that I know of, but it isn't overly original in approach. Most interactive tools, such as a spreadsheet, will have something like a DAG structure at their core to represent a model-view type dependency thingo. Wish I had more time to play with this stuff... Regards, Matt Hurd. _______________ Matt Hurd +61.2.8226.5029 hurdm@sig.com Susquehanna _______________ IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.