WizardryEE/Module/nss/lvl10_msg02.nss

void main()
{
    object oActor;

    // Get the creature who triggered this event.
    object oPC = GetEnteringObject();

    // Only fire for (real) PCs.
    if ( !GetIsPC(oPC)  ||  GetIsDMPossessed(oPC) )
        return;

    // Only fire once per PC.
    if ( GetLocalInt(oPC, "DO_ONCE__" + GetTag(OBJECT_SELF)) )
        return;
    SetLocalInt(oPC, "DO_ONCE__" + GetTag(OBJECT_SELF), TRUE);

    // Have "LVL10_MSG02" strike up a conversation with the PC.
    oActor = GetNearestObjectByTag("LVL10_MSG02", oPC);
    AssignCommand(oActor, ActionStartConversation(oPC, "", FALSE, FALSE));
}