Prevent save conflicts if user goes back; trap _back_ action

Since there is no way to prevent the users from using the "Back" button or going back with a right-mouse click or using the "Backspace" key, how can we prevent having problems such as save conflicts in a Web application if the user goes back? Can the "Back" action be trapped in any way?
There is no way that I know of to completely disable the "Back" functionality. However, you try to use the onUnload event of the page to redirect them back to the page... The problem is that this event fires anytime the page is unloaded, not only when they click back... You could try manipulating the expiration time of the form so that when they try go back, the form is not resubmitted, or you could try to build logic into the application to prevent inadvertent saves...

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