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Carino Realty, Inc. applied for registration of a 4.1-hectare agricultural lot under Presidential Decree No. 1529. After proper notice and a public hearing, the Regional Trial Court issued a decree of registration in Carino Realty’s favor. A neighboring occupants' association, the Maligaya Tenants’ Coop, asserts that it has tilled a portion of the land for over a decade and that it was not properly served with notice, contending that the proceedings violated due process. It files a petition for certiorari and prohibition under Rule 65 challenging the decree on grounds of grave abuse of discretion and lack of due process. (a) Identify the controlling doctrine governing the proper remedy to challenge a decree of registration. (b) Distinguish this remedy from ordinary appeals or other post-decree remedies in land registration. (c) Apply to the facts: Is the Maligaya Tenants’ Coop’s petition proper? What is the likely outcome and why?