1. Put InputAutoComplete web block from RichWidgets next to the related input field;
2. Use its id as input parameter for the web block;
3. Create an "OnNotify" screen action to handle the database search as follows:
  a) Create a SQL query with a search keyword as parameter, and use the action "NotifyWidgetGetMessage()" to use the typed value;
  b) The SQL query output should be of the type "Input_AutoComplete_ListEntry" with the label as the first column and the id as the second;
  c) Use the "Input_AutoComplete_ShowList" action to match the output of the SQL query with the input field;
  d) To get the id of the record selected in the input field, use the action "Input_AutoComplete_GetIdentifier".