---
title: "How do I use cookies for sharing callbacks?"
source_url: https://dev.digicert.com/trustcore-sdk/nanossl/faqs/how-do-i-use-cookies-for-sharing-callbacks.html
---

**Question:** I'm using the TrustCore SDK source code in a shared library for both a client application and a server application. I want to create only one set of callback functions and have them perform differently for the client versus the server. Is there a way to pass context information into a callback function?

**Answer:** Yes. Use the `SSL_setCookie` routine to associate custom information (cookie data) with a connection instance. If context information is stored in the cookie, callback functions may use the `SSL_getCookie` routine to retrieve the cookie and determine the context.