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The "Product Management System" application, we've been developing until now, has been based around single window. Whilst this works well, it would be useful for the user to be able to see information about another products while entering new data. As it stands, the user would have to cancel the new item number, query on the product_no, switch to data entry mode and begin to enter afresh the new product number along with its associated information.
This is all because the user can't open the same window more than once in the same application. If you try to open a window that is already open, PowerBuilder simply activates the opened window - it won't open another instance of the window.
To allow PowerBuilder to open several copies of the given window at the same time, in the same application, we have to convert our application to use Multiple Document Interface. We've already done some of the work required for this conversion in "Menu Painter" session, when we painted some menus and we'll be showing you how to implement these menus when we convert our application.
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