This is your last chance of skipping this very dangerous operation. You'll have no way of undoing it after this. Proceed at your own risk, and don't ever say I didn't tell you.
PLEASE cancel if you're a novice.
Are you absolutely sure of what you're doing?
Have you got a backup of your system file?
Have you got another startup disk to use in case of an accident?
Click ‘Cancel’ or type ‘Return’ if you don't.
Writing resources to the System File is not recommended by Apple. It's taboo.
You may use ResEdit to copy your new DSATs from a saved document into the System file, which would be a lot safer.