Connects A External Screen

I need the following to work a user uses vista on the laptop and the lcd on the laptop is his primary display. 1) Now he connects a external screen and reboots or uses mobility centre to connect it as display 2). However he wants it to show up and display as the left hand screen in the format 2) 1) with 1) remaining the primary display and the task bar not changing screens also with the mouse moving to the left hand screen by moving left.

This never works. if he connect external screen VISTA decides the screens should be connected 1)2) and you have to move right to get to the left hand screen. you have to move the screen in display setup to get this right but then vista will screw up and make the left hand external display the primary etc. Is there no way to get vista to remember that the external display should be 2) and not primary and also to make it the left hand screen in the desktop while not becoming the primary screen and taking the taskbar and start menu.