# Events ### What are the events? Events are an essential concept in HyperDbg. Almost all of the HyperDbg features are developed as an event. **Event** is the occurrence of an incident that is of interest to the debugger. This comprises a wide range of activities ranging from a specific system call (syscall) that the debugger is set to monitor, to access to a particular memory address. HyperDbg can be configured to perform arbitrarily defined actions upon the occurrence of each event. For example, hidden hooks are an event. When this event is triggered, your actions will be performed, or a syscall hook is an event. Whenever the system executes an **SYSRET** instruction or a **SYSCALL** instruction, then the event is triggered. --- # 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://docs.hyperdbg.org/design/debugger-internals/events.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.