I'd have to look. I'm rusty on how the existing solver works. Damien -----Original Message----- From: John Pye [mailto:john.pye at anu.edu.au] Sent: Wednesday, December 19, 2007 11:04 PM To: Damien Hocking; coin-ipopt at list.coin-or.org Subject: Re: [Coin-ipopt] IPOPT as an Excel solver plugin