Program flowchart.
  1. Main flowchart.
  * Start Program.(START)
    * Load data about path of file.(L1)
    * Load librarys.(L2)
    * Initialize system.(INIT)
      * Initialize basic variables.(I1)
      * Check and load DB/base configurations from configuration files.(I2)
      * Load message file.(I3)
      * Connect to database.(I4)
      * Setting up terminal for direct access to terminal.(I5)
      * Clear screen.(I6)
    * Authentication.(AUTH)
      * Read user ID and password.(A1)
      * Query to database.(A2)
      * COmpare data from console and from database.(A3)
      * Not equal: Go to A1 or go to exit(Go to CL).(A3-C1)
      * Equal: Continue.(A3-C2)
      * Setting up variable about information of authenticatied user.(A4)
    * Enter to main program.(LOOP)
      * Standby and execute.(EXEC)
        * Got normal command: Execute command and return to EXEC.(E1)
        * Got exit command: Go to exit(Go to CL).(E2)
    * CLean up.(CL)
      * Disconnect from database.(C1)
      * Setting up mode to normal.(C2)
  * End program.(END)