Extend Windows Desktop to second monitor - switching tool (repost)

I need a method to change the display settings of a machine to extend the Windows desktop to a second monitor. The method should have two functions; 1. allow me to extend the Windows desktop over two monitors (if the second monitor is available) 2. switch back to one monitor The new setting should be effective immediately without rebooting the machine. The above functions will be used in a current VB6 project, so the provided solution should be compatible with that programming language without installing any extra software or clients. Please let me know if you can build this and what method you would suggest ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Windows XP and higher. Should not cause problems (like crashes) when started on Windows 2000 End result must work in an existing VB6 project and should not require the user to register any dll or install any third party plugin/addon Should not require a restart and should work with normal user permissions