FORM CALL FROM

I have a naive Form 3 problem, form call form. The syntax can be simple like call(form_name). My questions are:
1. Does the form_name need to exist in Database or current directory?

   That is how to search this called form. 2. Do I have to declare this "form_name" in calling form since I

   have met PL/SQL error in my key-enter trigger    saying identifier 'form_name' must be declared    though this 'form_name' exists in both Database and current directory?    If I have to declare, how?

Please email me if/when possible.

Thanx!

-- 
Litao Wu                      
Computer Science Department    Phone: (303)491-8119
Colorado State University      Email: litao_at_cs.colostate.edu
Fort Collins, CO 80523