This event occurs just once before it display the search form. It can be used to set some default values to the fields. For example:
{company} = [glo_company];
Date fields are used differently, They use a suffix "dia" for day, "mes" for month and/or "ano" for year. For example, The {Birth} field will be:
{Birth_dia}=date("d");
{Birth_mes}=date("m");
{Birth_ano}=date("Y");