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; {找到所有的计算机}

（出处：www）