# Overview **Overview** An app interacts with an EtherealNetwork cluster by sending it transactions with one or more instructions. The EtherealNetwork runtime passes those instructions to programs deployed by app developers beforehand. An instruction might, for example, tell a program to transfer lamports from one account to another or create an interactive contract that governs how lamports are transferred. Instructions are executed sequentially and atomically for each transaction. If any instruction is invalid, all account changes in the transaction are discarded. To start developing immediately you can build, deploy, and run one of the examples. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ethereals-blockchain.gitbook.io/ethereal-chain-documentation/developing-on-native-ethereal/programming-model/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.