1. Computing
in Delphi MDI :: In an MDI application, more than one document or child window can be opened within a single parent window. What if you need to extract some data from the MDI child form being deactivated from the form being activated? You need to handle a special MDI Windows message: WM_MDIACTIVATE.

Read the full article to learn how to Implement OnActivate / OnDeactivate for MDI Child Forms - Get Previously Active.

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