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            |  |  |  |  
            |  |   |  |  
            |  | Sending a message |  |  
            |  | 
  
  Each modem can be attached to one or many Provider Queue folders.
  
  SMSD sub process controls the modem to send short messages.
  
  If sending fails, SMSD will try a second time.
  If it fails again, the SMS file will be moved into the Failed Folder.
  
  If sending fails 3x 2 times, then the program thinks that the modem is broken and disables it for a while.
   
 
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