Question : net sending to an IP

Well this is my first post on this board,

How come I cannot net send to an IP address other than mine?  I go to the command prompt type in the whole net send

and if I type in somone elses IP address, the command prompt just sits there.  After a while command prompt says it cannot send it to the address because it cannot find it on the network.  Ok why is it only sending to something on my network?  I made a program that creates a batch file with the net send command and executes it, works fine sending it to myself.  Im trying to make a chat for me and my friends at school.  

Is there something I need to change to get it to send stuff out of my network?  Whats the answer here *pulls out wad of hair*

Answer : net sending to an IP

Sorry partner, you cannot use the Net Send command line applet to cross network barriers in many cases.  The utility (in 2K/XP)requires connections to ports 135 (RPC endmap resolution), and a high port to be determined by the listening machine.  Most ISP's will not permit traffic on 135 because of the DCOM security risks.  You may want to look into a shareware app or writing a Winsock app in VB.  This would allow you to specify the ports you wish to use.

Good Luck