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ShowMouse makes the mouse cursor visible.
At the start of your progam, the mouse is invisible.
None.
{example for ShowMouse and HideMouse}
Uses Mouse;
Begin
  ClrScr;
  If MouseFound Then
    Begin
      Writeln('Now you can see the mouse... (press enter to continue)');
      ShowMouse;
      Readln;
      HideMouse;
      Writeln('And now you can''t... (press enter to quit)');
      Readln
    End
End.