var
Computer: array [1..500] of string[25];
ComputerCount: Integer;

procedure FindAllComputers(Workgroup: string);
var
EnumHandle: THandle;
WorkgroupRS: TNetResource;
Buf: array [1..500] of TNetResource;
BufSize: Integer;
Entries: Integer;
Result: Integer;
begin
ComputerCount := 0;
Workgroup := Workgroup + #0;
FillChar(WorkgroupRS, SizeOf(WorkgroupRS) , 0);
with WorkgroupRS do
begin
dwScope := 2;
dwType := 3;
dwDisplayType := 1;
dwUsage := 2;
lpRemoteName := @Workgroup[1];
end;

WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY, 0, @WorkgroupRS, EnumHandle);

repeat
Entries := 1;
BufSize := SizeOf(Buf);

Result := WNetEnumResource(EnumHandle, Entries, @Buf, BufSize);
if (Result = NO_ERROR) and (Entries = 1) then
begin
Inc( ComputerCount );
Computer[ ComputerCount ] := StrPas(Buf[1].lpRemoteName);
end;
until
(Entries <> 1) or (Result <> NO_ERROR);

WNetCloseEnum( EnumHandle );
end;