EMERGENCY PLAN—  Provides for the protection, removal, or destruction of classified material. EP (ELECTRONIC   PROTECTION)—   Involves actions taken to ensure friendly effective use of the electromagnetic spectrum despite an enemy’s use  of  electronic  warfare.  EP  replaces  elec- tronic  counter-countermeasures  (ECCM). EXTRACTS— Portions of naval warfare publica- tions  that  are  extracted/reproduced  for  use  in training  or  operations.  All  extracts  must  be properly  marked  with  security  classification  and safeguarded. F FLASH   PRECEDENCE—   Identified   by   the precedence prosign “Z.” Category reserved for initial   enemy   contact   reports   or   operational combat messages of extreme urgency. Brevity is mandatory.  Speed  of  service  objective  is  not fixed. Handled as fast as humanly possible with an objective of less than 10 minutes. FRD  (FORMERLY   RESTRICTED   DATA)– Pertains  to  defense  information  that  has  been removed from the Restricted Data category but is  still  safeguarded  as  classified  defense information. G GENERAL  MESSAGE—  A message with wide, predetermined  and  standard  distribution. I IFF (IDENTIFICATION  FRIEND  OR  FOE)—  A system  using  electromagnetic  transmissions  to which   equipment   carried   by   friendly   forces automatically  responds  to  distinguish  themselves from enemy forces. IMMEDIATE  PRECEDENCE—  Identified  by  the precedence  prosign  “O.”  Delivery  time  reserved for very urgent messages relating to situations that  gravely  affect  the  security  of  national/allied forces.  Examples  of  use:  amplifying  report  of initial  enemy  contact  or  unusual  major movements of military forces. Speed of service objective is 30 minutes to 1 hour. AI-2 INMARSAT   (INTERNATIONAL    MARITIME SATELLITE  COMMUNICATIONS)—  A satellite  system  that  interfaces  naval  com- munications  for  the  DON  and  commercial telecommunications  authorized  by  law. I/O CONTROL CLERK—  The  person  responsible for  the  quality  and  control  of  data  processing input and output media and products. J JETTISONING—   A  type  of  destruction  that  is completed  by  throwing  material  overboard  at sea at a depth of at least 1,000 fathoms or more; also  known  as  Sinking. JOB  DEPENDENCY—  When a job requires the output   from   another   job,   it   is   said   to   be dependent on another job. JOB-RELATED  INFORMATION—  Information about  the  resources,  media,  and  time  needed  for a particular job. JULIAN DATE—  Consists of seven digits; the first three digits represent the date, and the last four digits  represent  the  hour  and  minutes;  begins  on the first day of the calendar year. M MARS  (MILITARY   AFFILIATE   RADIO   SYS- TEM)— Provides auxiliary communications to military,  civil,  and/or  disaster  officials  during periods  of  emergency.  Users  are  licensed  by the   Federal   Communications   Commission (FCC). MULTIPLE-ADDRESS MESSAGE—  A message with two or more addressees. MULTIPROCESSING—  A computer processing mode  that  provides  for  simultaneous  processing of two or more programs or routines by use of multiple  CPU’s. MULTIPROGRAMMING—  A computer processing mode  that  provides  for  overlapping  or  inter- leaving the execution of two or more programs at the same time by a single processor.