void main()
{
 object oPC = GetEnteringObject();
 object oAlter = GetObjectByTag("DROWALTER");
 effect eGlow = EffectVisualEffect(VFX_DUR_GLOW_RED);
 int DoOnce = GetLocalInt(OBJECT_SELF, GetTag(OBJECT_SELF));

if (DoOnce==TRUE) return;

SetLocalInt(OBJECT_SELF, GetTag(OBJECT_SELF), TRUE);
ApplyEffectToObject(DURATION_TYPE_PERMANENT, eGlow, oAlter);
}