void main()
{

object oPC = GetEnteringObject();

if (!GetIsPC(oPC)) return;

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

if (DoOnce==TRUE) return;

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

object oTarget;
oTarget = GetObjectByTag("skwelldoor");


    object oActor;

    // 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 "void main()" strike up a conversation with the PC.
    oActor = GetNearestObjectByTag("ctplr", oPC);
    AssignCommand(oActor, ActionStartConversation(oPC));
}