void main()
{
object oPC = GetEnteringObject();
object oArea = OBJECT_SELF;

if  (!GetIsDM(oPC) && GetLocalInt(oArea,"Spawner") == 0)
{
object oLoc = GetNearestObjectByTag("WP_RESPAWN", oPC);
location lLoc = GetLocation(oLoc);
CreateObject(OBJECT_TYPE_PLACEABLE,"arearespawn",lLoc);
SetLocalInt(oArea,"Spawner",1);
}

// whatever else on enter you do
}