Hi, I am new to Writing Windows Service apps and having problems.

Written in Delphi, I have written a normal windows application to check and debug the major parts of the code and now have to convert it to an NT Service.

My code has to launch a windows application which I do using the following code.

function Run_Program : boolean;
   var SEInfo : TShellExecuteInfo;
   ExitCode : DWORD;
   begin
     Result := false;
     FillChar(SEInfo, SizeOf(SEInfo),0);
     SEInfo.cbSize :=SizeOf(TShellExecuteInfo);
     With SEInfo do
     begin
       fMask := SEE_MASK_NOCLOSEPROCESS;
       Wnd := **Application.Handle**;
       lpFile := PChar(Exe_Prog);
       lpParameters := PChar(Exe_Param);
       nShow := SW_SHOWNORMAL;
     end;
     If ShellExecuteEx(@SEInfo) then
     begin
       repeat
         Application.ProcessMessages;
         GetExitCodeProcess(SEInfo.hProcess, ExitCode);
       until (ExitCode <> STILL_ACTIVE) OR Application.Terminated OR NOT q1.fieldbyName('Delay').AsBoolean;
       If ExitCode <> STILL_ACTIVE then Record_Event(Exe_Prog + ' completed ') else
          Record_Event(Exe_Prog + ' activated ');
       Result := true;
     end
     else Record_Event('Error Starting '+ Exe_Prog+ ' ');
  end;

When this is put in the service app the compiler fails with 3 errors: Undeclared identifiers.. 1) Handle 2) ProcessMessages and 3) Terminated.

My question is.. are there equivalent procedures that can be used in a service application or should I approach the problem differently in a service application?

Any help would be appreciated