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uses
  windows, WinSvc;

// ...

function ServiceGetStatus(sMachine, sService: PChar): DWORD; 
  {******************************************} 
  {*** Parameters: ***} 
  {*** sService: specifies the name of the service to open 
  {*** sMachine: specifies the name of the target computer 
  {*** ***} 
  {*** Return Values: ***} 
  {*** -1 = Error opening service ***} 
  {*** 1 = SERVICE_STOPPED ***} 
  {*** 2 = SERVICE_START_PENDING ***} 
  {*** 3 = SERVICE_STOP_PENDING ***} 
  {*** 4 = SERVICE_RUNNING ***} 
  {*** 5 = SERVICE_CONTINUE_PENDING ***} 
  {*** 6 = SERVICE_PAUSE_PENDING ***} 
  {*** 7 = SERVICE_PAUSED ***} 
  {******************************************} 
var 
  SCManHandle, SvcHandle: SC_Handle; 
  SS: TServiceStatus; 
  dwStat: DWORD; 
begin 
  dwStat := 0; 
  // Open service manager handle. 
  SCManHandle := OpenSCManager(sMachine, nil, SC_MANAGER_CONNECT); 
  if (SCManHandle > 0) then 
  begin 
    SvcHandle := OpenService(SCManHandle, sService, SERVICE_QUERY_STATUS); 
    // if Service installed 
    if (SvcHandle > 0) then 
    begin 
      // SS structure holds the service status (TServiceStatus); 
      if (QueryServiceStatus(SvcHandle, SS)) then 
        dwStat := ss.dwCurrentState; 
      CloseServiceHandle(SvcHandle); 
    end; 
    CloseServiceHandle(SCManHandle); 
  end; 
  Result := dwStat; 
end; 

function ServiceRunning(sMachine, sService: PChar): Boolean; 
begin 
  Result := SERVICE_RUNNING = ServiceGetStatus(sMachine, sService); 
end; 


function ServiceStart(Machine, ServiceName: string): Boolean;
// Machine is UNC path or local machine if empty
var
  h_manager, h_svc: SC_Handle;
  ServiceStatus: TServiceStatus;
  dwCheckPoint: DWORD;
  ServiceArgVectors: PChar;
begin
  h_manager := OpenSCManager(PChar(Machine), nil, SC_MANAGER_CONNECT);
  if h_manager > 0 then
  begin
    h_svc := OpenService(h_manager, PChar(ServiceName),
      SERVICE_START or SERVICE_QUERY_STATUS);
    if h_svc > 0 then
    begin
      if (StartService(h_svc, 0, ServiceArgVectors)) then { succeeded }
      begin
        if (QueryServiceStatus(h_svc, ServiceStatus)) then
        begin
          while (SERVICE_RUNNING <> ServiceStatus.dwCurrentState) do
          begin
            dwCheckPoint := ServiceStatus.dwCheckPoint;
            Sleep(ServiceStatus.dwWaitHint);
            if (not QueryServiceStatus(h_svc, ServiceStatus)) then
              // couldn't check status
              break;
            if (ServiceStatus.dwCheckPoint < dwCheckPoint) then
              break;
          end;
        end;
      end;
      CloseServiceHandle(h_svc);
    end;
    CloseServiceHandle(h_manager);
  end;

  Result := (SERVICE_RUNNING = ServiceStatus.dwCurrentState);
end;

function ServiceStop(Machine, ServiceName: string): Boolean;
// Machine is UNC path or local machine if empty
var
  h_manager, h_svc: SC_Handle;
  ServiceStatus: TServiceStatus;
  dwCheckPoint: DWORD;
begin
  h_manager := OpenSCManager(PChar(Machine), nil, SC_MANAGER_CONNECT);
  if h_manager > 0 then
  begin
    h_svc := OpenService(h_manager, PChar(ServiceName),
      SERVICE_STOP or SERVICE_QUERY_STATUS);
    if h_svc > 0 then
    begin
      if (ControlService(h_svc, SERVICE_CONTROL_STOP, ServiceStatus)) then
      begin
        if (QueryServiceStatus(h_svc, ServiceStatus)) then
        begin
          while (SERVICE_STOPPED <> ServiceStatus.dwCurrentState) do
          begin
            dwCheckPoint := ServiceStatus.dwCheckPoint;
            Sleep(ServiceStatus.dwWaitHint);
            if (not QueryServiceStatus(h_svc, ServiceStatus)) then
              // couldn't check status
              break;
            if (ServiceStatus.dwCheckPoint < dwCheckPoint) then
              break;
          end;
        end;
      end;
      CloseServiceHandle(h_svc);
    end;
    CloseServiceHandle(h_manager);
  end;

  Result := (SERVICE_STOPPED = ServiceStatus.dwCurrentState);
end;