//Put this script OnEnter
void main()
{

object oPC = GetEnteringObject();

if (!GetIsPC(oPC)) return;

int DoOnce = GetLocalInt(oPC, GetTag(OBJECT_SELF));

if (DoOnce==TRUE) return;

SetLocalInt(oPC, GetTag(OBJECT_SELF), TRUE);

if (GetItemPossessedBy(oPC, "bosstoken")== OBJECT_INVALID)
   {
   CreateItemOnObject("bosstoken", oPC);

   }
}