This server behavior let's you create a repeat region without using a recordset but on setup yourselfe the number of record, or get the number of record from a form field.
Use this behavior to create a MultiRecord insert page, and the standard Dw repeat region based on recordset to create a MultiRecord Update or Delete page.
When you want setup a fix number of record you must insert the number in the Repeat field of the behavior panel, and if you want setup the number of record dynamic you must use the parameter "dwzRepeatItems" for example you can call your page from a link like "YourPage.php?dwzRepeatItems=6", this will create a repeat region with 6 records