Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

// The NetUserEnum function provides information about all user accounts on a server. 

type
   USER_INFO_1 = record
     usri1_name: LPWSTR;
     usri1_password: LPWSTR;
     usri1_password_age: DWORD;
     usri1_priv: DWORD;
     usri1_home_dir: LPWSTR;
     usri1_comment: LPWSTR;
     usri1_flags: DWORD;
     usri1_script_path: LPWSTR;
   end;
   lpUSER_INFO_1 = ^USER_INFO_1;

 function NetUserEnum(ServerName: PWideChar;
   Level,
   Filter: DWORD;
   var Buffer: Pointer;
   PrefMaxLen: DWORD;
   var EntriesRead,
   TotalEntries,
   ResumeHandle: DWORD): Longword; stdcall; external 'netapi32.dll';

 function NetApiBufferFree(pBuffer: PByte): Longint; stdcall; external
 'netapi32.dll';

 {...}

 procedure TForm1.Button1Click(Sender: TObject);
 var
   EntiesRead: DWORD;
   TotalEntries: DWORD;
   UserInfo: lpUSER_INFO_1;
   lpBuffer: Pointer;
   ResumeHandle: DWORD;
   Counter: Integer;
   NetApiStatus: LongWord;
 begin
   ResumeHandle := 0;
   repeat
     // NetApiStatus := 
    // NetUserEnum(PChar('\\NT-Domain'), 1, 0, lpBuffer, 0,EntiesRead, TotalEntries, ResumeHandle); 
    NetApiStatus := NetUserEnum(nil, 1, 0, lpBuffer, 0, EntiesRead,
       TotalEntries, ResumeHandle);
     UserInfo     := lpBuffer;

     for Counter := 0 to EntiesRead - 1 do
     begin
       listbox1.Items.Add(WideCharToString(UserInfo^.usri1_name) + ' --> ' +
         WideCharToString(UserInfo^.usri1_comment));
       Inc(UserInfo);
     end;

     NetApiBufferFree(lpBuffer);
   until (NetApiStatus <> ERROR_MORE_DATA);
 end;