# Xid You've probably seen references to **xid** in a few places. What is it, exactly? The X stands for "External," and **xid** is the id number that *you* know your constituents by. In computer-science-y terms, it's the primary key of your warehouse table. AlumnIQ can integrate with any warehouse provider out there. Harris? No problem. Salesforce? You bet. Just a spreadsheet? Yeah, we can do that too. (I think you get the picture...) We use the term "xid" to refer to *your* constituent id number because each warehouse provider calls it something different. For consistency's sake, we just call it **xid** no matter where your warehouse data comes from. --- # 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://help.alumniq.com/common-features/xid.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.