Author: Jonas Bilinkevicius

I want the form only to appear once on the user's desktop regardless of whether it 
has focus or not.

Answer:

Solve 1:

1   type
2     TForm2 = class(TForm)
3       {other stuff above}
4       procedure CreateParams(var Params: TCreateParams); override;
5       {other stuff below}
6     end;
7   
8   procedure TForm2.CreateParams(var Params: TCreateParams);
9   begin
10    inherited CreateParams(Params);
11    Params.Style := Params.Style and not WS_OVERLAPPEDWINDOW or WS_BORDER
12  end;



Solve 2:

For a MDI child form, setting the BorderStyle to bsNone does not remove the title 
bar. This does it:
13  
14  procedure tMdiChildForm.CreateParams(var Params: TCreateParams);
15  begin
16    inherited CreateParams(Params);
17    Params.Style := Params.Style and (not WS_CAPTION);
18  end;