One possibility is that function keys are not enabled as function keys on the keyboard. I have a Microsoft keyboard that has an F Lock button in the upper right area and an F LOCK light in addition to the Numeric Lock, Shift Lock and Scroll Lock lights. If F Lock is not enabled, the function keys are reassigned to Microsoft specific functions (Help, Undo, Redo, New, Open, CLose, Reply, Fwd, Send, Save and Print).
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