MDI Forms using MainMenu

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Whenever I launch an MDI Child, I can add items to the MDI Parent's MainMenu
easy enough, but how do I call them from the MDI Child?

In the Parent,

private void miPrint_Click(object sender, EventArgs e) { /* code */ }

What changes? The Menu Item miPrint is still located in the Parent. Do I
need to check the sender object?

Whenever text is selected in my MDI Child, how do I tell the MDI Parent's
MainMenu to activate the Cut/Copy menu items?

If I click "Select All" in the MainMenu, how do I tell the active MDI Child
to respond to this?

MDI Forms are new to me, and they don't seem to be covered in many books.