>We developed a Material Management Systems (MMS) which consist of many modules such as procurement, stores, subcontract and so on.
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>What I have in mind is that the user will login once to MMS and then he select the module he wants to access from the switchboard screen, at the same time he should be able to open more than one module at a time, so the swithboard screen should be available while MMS application is running.
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>Keeping in mind that each module is an application.

Nabil,

I would suggest dumping the switchboard screen in favor of a system menu, or at least use the menu in addition to the screen. Under file you can list the modules. When the user choose to run a certain module, you run its menu which would add a pad or pads to the current system menu. When the user exits a module you remove its menu from the system menu.

Just be sure that each module creates a control object at its start up along with adding its menu. Each option on a modules menu calls its own control object for action. You can code the methods of teh control object so that it runs code in the appropriate application.