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: as you all know, most mac securities can be broken using the shift key 
: to shut off extensions.  I was wondering if it possible to dsable this 
: command.  Please help.  I am responsible for my school's computer 
: security and this command negates such programs as foolproof.

Only the weak ones can be disabled like this, but yes you can stop it.
Simply delete the resource of type 'dbex' from the System file. The shift
key will no longer disable the extensions after that. Of course someone
can still boot from a floppy or CD.

Scott Kevill.