Parameters:

Interlinking among forms can be achieved through opening needs forms from the current form and passing needs information to the called form.

When opening associated forms, in a commercial application it is suitable in which the mode of operation in the called form and the calling form are the similar.

Example:

If the mode of operation in the client form is QUERY then the mode of operation in the order form must also be QUERY and information regarding the sales orders placed through the current client must be retrieved from the table.

Same, if the mode of operation in the client form is INSERT, the mode of operation in the order form must also be INSERT and information pertaining to the present client must be set by the system in INSERT mode.

Therefore the mode of operation must be passed to the order form. The client_no related with the current client must also be passed to the order form. A client_no passed from the client form can then be used to retrieve corresponding order information if the mode of operation is QUERY. If the mode of operation is INSERT then client_no can be used to set the value of the text item which are associated with the client_no column in the sales_order table.

Whenever any form is invoked by using the OPEN_FORM or CALL_FORM procedures then Parameter values from a calling form can be passed to a called form.