input double LOT = 0.01;
input int SLIP = 1;
input int MAGIC = 12345;

static int TicketNumber;

int OnInit() {

    return (INIT_SUCCEEDED);
}

void OnDeinit(const int reason) {
}

void OnTick() {

    if (OrdersTotal() == 0 && Hour() == 10) {
        TicketNumber = OrderSend(Symbol(), OP_BUY, LOT, Ask, SLIP, 0, 0, "BUY", MAGIC, 0, clrRed);
    }
    if (OrdersTotal() > 0 && Hour() == 12) {
        bool Exit = OrderClose(TicketNumber, LOT, Bid, SLIP, clrDodgerBlue);
    }
}