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Many Web applications do not contain overly confidential and personal information like bank account numbers or credit card data . Under X , applications do not need to be running on the same computer that is interacting with the user . If the applications do n't specify a realm to SASL , most mechanisms will default to this . Leaving the file world readable means that those applications do not need to be privileged to perform their task . These applications need not be reviewed and scored again if the program 's evaluation criteria has not changed . Although the package itself is quite large , applications need not import all the components of Twisted , so run-time overhead is kept to a minimum . Fortunately , most applications do not need a solution to the general schema evolution problem ; instead , they sufficiently constrain the problem so that relatively simple solutions are possible .