Class A compulsory directive
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A class-A compulsory directive is a standard Starfleet command directive regarding resources for a starship's main computer. The initiation of a class-A compulsory directive involves use of all necessary computing resources toward the resolution of the specified problem to the exclusion of all other directives.
Spock ordered the USS Enterprise's main computer to calculate the value of pi to the final digit using a class-A compulsory directive when the Redjac entity took possession of the computer in 2267. Because pi is a transcendental figure with no definitive end, the computer would be continually focused on the task until ordered otherwise. (TOS: "Wolf in the Fold")
