Leer la documentacion:
http://docwiki.embarcadero.com/RADStudio/Seattle/en/VCL
http://docwiki.embarcadero.com/RADSt...I_Applications
http://docwiki.embarcadero.com/RADSt...n/VCL_Overview
http://docwiki.embarcadero.com/RADSt...7s_Guide_Index
http://stackoverflow.com/questions/1...ment-interface
Cita:
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MDI was developed back in the Windows 3 days (or possibly earlier?) and isn't well-supported these days. If you need multiple documents with different forms, I'd recommend using a tabbed interface. Use frames instead of forms, and create the new tabs and place a frame on it, aligned alClient.
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Una alternativa mas sana a MDI es usar Tabs (pestañas). De esta forma podes consultar cual es la activa (propiedades ActivePage, ActivePageIndex)
A mi personalmente me gusta usar Forms lo mas posible, y sobre todo irlos mostrando con ShowModal; Tabs lo dejo mas para moviles