A security hotfix is serious business. While it is easy to determine if a DLL has any current handles open (SysInternals' HandleEx does this quite nicely) in a dynamic environment, it's dangerous to go swapping out critical security DLLs and hope it all works. While there may be some solution to the rebooting problem, on any OS, when applying critical security patches, a reboot is recommended (yes, even Unix).
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