What is the exact description of "in the same network"

Question

Hi where,
in my household i use my devices (Mac, iphone, apple tv, etc) on different floors. if the device support ethernet (ex. apple tv) i use ethernet, because of less radio radiation and more speed.
Often "wake on Lan" for my mac based itunes library not working. The same for itunes wlan syncing and other feature (remote on iphone or connect "computer" on apple tv) . In the most help descriptions i read "the devices have to be in the same network". I tried different configuration:
1) connect my mac via gbit ethernet : problems persists
2) connect my mac via wlan: the problem persists, sometimes it works ,sometimes not. Additional, some application are slow (stream etc.), that normal, because gbit ethernet ping gives <10 ms, wlan ping gives  <100 ms.
I "played" with some technical parameters, like radio channel on my airport to reduces possible inferences etc., but no luck
3) connect both ethernet and wlan: the problem seems to be solved, but i "feel" some trouble about the two activated interfaces to the same system (some freeze, who i blame to the double interface, perhaps)
So, what means "in the same network" exactly. Bind to the same hub? in the same WLAN network ? What is the idea behind that? Why not bridging bonjour and wake on lan?
thx

Answer 1

for the second question
import java.util.*;
import java.text.*;
public class Test{
    public static void main(String[] args) {
         DateFormat df = new SimpleDateFormat ("HH.mm");
         System.out.println (df.format (new Date()));
}Running this program at 22:03 (10:03 pm):
C:\Temp>java -cp . Test
22.03