open form with parameters

[baasu]

i m opening a form as

OPEN_FORM (form_name , activate, session, share_library_data, pl_id);

i have created a parameter list and added a text type parameter.

now my question is when the form opens, is there anyway that i can use the parameter value to manipulate the form

and can i assign the parameter value to a variable.

if yes please tell me how

thanx in advance