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Internal operating system usage. Handles keys after square key i.e. starts new application or does redirection.
Related calls
OS_Poll, poll for an application
DC_Pol, poll for card usage
DC_Nam, name current process
OS_Ent, enter an application
DC_Ent, enter new application
OS_Exit, exit an application
OS_Bye, exit application
DC_Bye, exiting current application
OS_Stk, stack current process (application)
OS_Use, process card usage