Verificar se o Processo Existe [Delphi]

Essa função retorna TRUE se ela encontrar o processo


function ProcessoExiste(ExeFileName: string): boolean;
const
  PROCESS_TERMINATE=$0001;
var
  ContinueLoop: BOOL;
  FSnapshotHandle: THandle;
  FProcessEntry32: TProcessEntry32;
begin
result := false;

FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
FProcessEntry32.dwSize := Sizeof(FProcessEntry32);
ContinueLoop := Process32First(FSnapshotHandle,FProcessEntry32);

while integer(ContinueLoop) <> 0 do
begin
if ((UpperCase(ExtractFileName(
    FProcessEntry32.szExeFile)) = UpperCase(ExeFileName))
    or (UpperCase(FProcessEntry32.szExeFile) = UpperCase(ExeFileName))) then
   begin
Result := true;
exit;
end;
ContinueLoop := Process32Next(FSnapshotHandle,FProcessEntry32);
end;
CloseHandle(FSnapshotHandle);
end;

Exemplo

   if ProcessoExiste('calc.exe') then

      ShowMessage('Calculadora aberta')

   else

      ShowMessage('Calculadora fechada');