Login all user accounts on startup

HI there

I have found no guidance anywhere on this question and thought that this forum may have ideas.

I want my computer, when it boots up, to automatically log into all existing user accounts.

I am thinking that a script may be the way to go, set to auto run when the Mac boots into the main user account.

Anyone have any ideas on this?

Thanks

Model: MacBook Pro
Browser: Safari 535.7
Operating System: Mac OS X (10.6)