The binding legal principles established are: (1) Lis alibi pendens is established when there is pending litigation between the same parties (or their privies) based on the same cause of action and in respect of the same subject matter. (2) In determining whether lis pendens exists, the court should consider the substance of the pending cases and not merely their form. (3) Once lis pendens is established, the court has a discretion whether to stay one action pending the decision of the other, and in exercising this discretion, the court has regard to the equities, the balance of convenience, and ultimately whether justice will be done without the double remedy. (4) Where a prior court order already regulates the rights and obligations of parties pending determination of a substantive case, it is not in the interests of justice to allow a subsequent application that would conflict with or undermine that order.