10 Counsel for the defendant contended, however, that Master Ng's order finally determined the question of liability for costs between the parties. The defendant submits that Master Ng's order dealt with the plaintiffs' right to costs in relation to both the Action and the contractual document, being the mortgage. The defendant pointed out that the issue of the plaintiffs' contractual right to costs was raised before Master Ng, and that he declined to make an order for indemnity, solicitor and client, or non-litigious costs. Instead, the Master made a "compromise order" which the defendant submits takes account of the plaintiffs' contractual right to costs, and of which counsel for the plaintiffs and the defendant expressed their approval. The defendant asserts, therefore, that no question of remaining liability as to costs is left open by the Master's order and that the present application amounts to a collateral attack upon a final decision of the Master.