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If user run installer where one of next folders exists "SUNWspro" "netbeans-6.1" for Solaris and "sunstudioceres" and "netbeans-6.1" for Linux then it stops the working. I agree that notification about existence of such folders should be, but I hope to have some interactivity at this step. Do you want to replace it and continue installation? -Yes, for this dir, -Yes for all dirs, -No, stop installing.
There is no interactive behavior in this installer.
ok