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530 Part III: Developing E-mail Solutions . If $step is set to 3, then the database field map that maps the standard personalization fields such as REC_ID, FIRST, LAST, AGE, SEX, INCOME, and EMAIL is stored in the database using the addDatabaseFieldMap method. modifyDriver() This method uses $step, a variable set in the modify list interface forms, to control which method is called. The $step variable is used to select the appropriate method for the appropriate stage of the list modification process. Here is how the modifyDriver() method works: . If $step is not set, then the first step of the modify list process is started by calling displayModifyListMenu(), which shows the modify list interface. This interface sets the $step to 2, using a hidden HTML field. . If $step is set to 2, then the second step of the modify list process is started by calling the modifyList() method. This method stores the list configuration data collected in the previous step and displays the database field mapping interface by calling the takeMap() method. This interface sets the $step value to 3. . If $step is set to 3, then the database field map that maps the standard personalization fields such as REC_ID, FIRST, LAST, AGE, SEX, INCOME, and EMAIL are stored in the database using the modifyDatabaseFieldMap method. authorize() See the authorize() method in the e-campaign user interface application called ecampaign_mngr.php for details. displayAddListMenu() This method displays the add list interface. displayModListMenu() This method displays the modify list interface. modifyList() This method is called when a user makes changes in the modify interface shown by displayModListMenu(). The modifyList() method creates a list object and calls its modEcampaignList() method to update the list in the database.