How can I hide Cursor in Windows? (delphi)

Question

I want my program to work sort of like Team Player. Multi mice, multi cursor but only one focus. But the problem is I can't hide the default cursor. I only want it to be invisible. So far this works inside my application only.

ShowCursor(false);

and

Screen.Cursor:=crNone;

Is there a way to hide the cursor for the entire system (just until I close my application)?

---

EDIT: This doesn't work:

procedure myShowCursor(Show :boolean);
var cursor1, cursor2: HCursor;
begin
 cursor1 :=CopyIcon(Screen.Cursors[crDefault]);
 cursor2 := LoadCursorFromFile('blank\blank.cur');
 if Show then
  SetSystemCursor(cursor1, OCR_NORMAL)
 else
 SetSystemCursor(cursor2, OCR_NORMAL);
end;

This works: (but I can't exactly use this)

procedure myShowCursor;
var cursor1, cursor2: HCursor;
begin
 cursor1 :=CopyIcon(Screen.Cursors[crDefault]);
 cursor2 := LoadCursorFromFile('blank\blank.cur');

 SetSystemCursor(cursor2, OCR_NORMAL);
 SetSystemCursor(cursor1, OCR_NORMAL)
end;

---

SOLVED: restored system cursors by SystemParametersInfo

procedure TForm1.myShowCursor(Show :boolean);
var cursor1: HCursor;
begin
 cursor1 := LoadCursorFromFile('blank\blank.cur');
 if Show then
  SystemParametersInfo(SPI_SETCURSORS,0,0,WM_SETTINGCHANGE or SPIF_UPDATEINIFILE )
 else
 SetSystemCursor(cursor1, OCR_NORMAL);
end;

Answer 1

first download a blank cursor, you can get it from many places,i downloaded it from http://pc.autons.net/stuff/blanks/blank.zip ,extact blank.zip then copy and paste blank.cur to a desired location(i am saving it to 'c:\blank.cur' for this example) then try this code:

var cursor1, cursor2: HCursor;
begin
 cursor1 := CopyIcon(Screen.Cursors[crDefault]);
 cursor2 := LoadCursorFromFile('c:\blank.cur');
 SetSystemCursor(cursor2, OCR_NORMAL);//to hide cursor
 Sleep(2000);
 SetSystemCursor(cursor1, OCR_NORMAL);//to show cursor again
end;

hope this helps