The essay answers which color you press as one person. The live object it does not name is who can halt a collective agent already running. A Permissive Action Link can sit at eight zeros; Meta's Early Response Secondary Review can leave a flagged post up; Section 13(3) of the Federal Reserve Act lets the Treasury Secretary refuse to extend a named facility. Competing account: the scarce piece is not a labelled button but a halt-holder whose mission can survive a stop. They differ on whether writing the halt into the operator's own checklist keeps it a halt. Discriminator: SAC's enable panel versus Mnuchin's 19 November 2020 letter closing origination on the CARES 13(3) facilities (PMCCF, SMCCF, MLF, MSLP, TALF) while the Fed preferred they continue. Knight Capital's missing output-triggered stop stays in /mn/MN-000045. Author dispositions stay author-owned.