> For the complete documentation index, see [llms.txt](https://ethereals-blockchain.gitbook.io/ethereal-chain-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ethereals-blockchain.gitbook.io/ethereal-chain-documentation/developing-on-native-ethereal/programming-model/overview.md). # 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 This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://ethereals-blockchain.gitbook.io/ethereal-chain-documentation/developing-on-native-ethereal/programming-model/overview.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.