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What is difference between open_form and call_form?
ORACLE Interview Questions and Answers (Part 1)
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134. What is difference between open_form and call_form?
when one form invokes another form by executing open_form the first form remains displayed, and operators can navigate between the forms as desired. when one form invokes another form by executing call_form, the called form is modal with respect to the calling form. That is, any windows that belong to the calling form are disabled, and
operators cannot navigate to them until they first exit the called form.
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