You can use "SKIP FOR":



DEFINE BAR 5 OF Policy PROMPT "Letters" ;
SKIP FOR (TYPE('pol_ltrs') = "O" AND !ISNULL(pol_ltrs))

ON SELECTION BAR 5 OF Policy DO FORM pol_ltrs NAME pol_ltrs


>Hi all,
>
>How can I check if the user starts a form before. I want the user not to be able to start the same form again, because the form is already open? I start my forms from a pull down menu.
>
>Thanks in advance.
>Ron :o)