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This routine is used by the card manager routine (part of the interruption code) to verify if there was a card before removal. It is the long bleep after an application card removal with active process.
Related calls
OS_Poll, poll for an application
OS_Stk, stack the current process (application)
OS_Ent, enter an application
DC_Ent, enter new application
DC_Nam, name current application
OS_Exit, exit an application
OS_Bye, exit application
DC_Bye, exiting current application
OS_Use, process card usage
DC_Alt, pass an alternative character