return null;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#allowChain(jcifs.internal.CommonServerMessageBlockRequest)
     */
    @Override
    public boolean allowChain(final CommonServerMessageBlockRequest next) {
        return false;
    }

    /**
     * {@inheritDoc}
     *

        return getAsyncId() != 0;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#allowChain(jcifs.internal.CommonServerMessageBlockRequest)
     */
    @Override
    public boolean allowChain(final CommonServerMessageBlockRequest next) {
        return getConfig().isAllowCompound(getClass().getSimpleName()) && getConfig().isAllowCompound(next.getClass().getSimpleName());

    /**
     * Checks if chaining is allowed with the next request.
     *
     * @param next the next request in the chain
     * @return whether to allow chaining
     */
    boolean allowChain(CommonServerMessageBlockRequest next);

    /**
     * Sets the tree ID.
     *
     * @param t the tree ID to set
     */
    void setTid(int t);

    /**