What is the purpose and significance of the invocations (Mangalacharan) described at the beginning of Shri Sai Satcharitra?

According to Chapter 1, the purpose of performing auspicious invocations, or Mangalacharan, at the start of any task is to ensure its obstacle-free completion and to obtain the grace of the desired deity. The author offers salutations to various deities for the fulfillment of the desired goal, which is writing the Satcharitra. The text explicitly states that this traditional etiquette of bowing to the desired deity is adopted for attaining auspiciousness. This opening chapter emphasizes that by invoking these divine figures, the author seeks the removal of all obstacles for the successful completion of the work.