float range = 3.0; // metres
float interval = 5.0; // seconds

default
{
 state_entry()
 {
 llSensorRepeat("", "", AGENT, range, TWO_PI, interval); // activates the sensor.
 // look for avatars (i.e. not moving objects) on all sides of the object
 }

 sensor (integer numberDetected)
 {
 string msg = "Detected "+(string) numberDetected+" avatar(s): ";
 integer i;
 msg += llDetectedName(0);
 for (i = 1; i < numberDetected; i++)
 {
 msg += ", ";
 msg += llDetectedName(i);
 }
 llWhisper(0, msg);
 }

 no_sensor()
 {
 llWhisper(0, "Nobody is near me at present.");
 }
}