PaulS:
It looks to me like you have not configured your XBees correctly. You haven't even mentioned what kind they are, or how (or even if) you have configured them.
i did configure it like you told before in another forum(topic)..and it's work when i insert the coding like below.. only when i add some coding to make it works with vb, it didnt blink at all. here is the code without inserting vb..
transmitting part
void setup ()
{
Serial.begin (9600);
}
void loop ()
{
Serial.print ('H');
delay (2000);
Serial.print ('L');
delay (2000);
}
receiver part is same like previous..i did not change anything..