“presence”，也作“presence information”，中文一般译为“呈现”，用以传达某一用户通过一组设备进行通信的能力和意愿。拿常见的MSN Messenger来举例，MSN v7.5为用户提供的可选状态有：联机、忙碌、马上回来、离开、接听电话、外出就餐和显示为脱机。这些状态便称为“presence状态”，它们表征了用户当前处于的某种状态和用户进行通信的意愿。-You may use this document or any part of the document for internal or educational purposes only, provided you do not modify, edit or take out of context the information in this document in any manner.　Information contained in this document may be used, at your sole risk, for any purposes.　You may not use this document in any other manner without the prior written permission of the Open Mobile Alliance.　The Open Mobile Alliance authorizes you to copy this document, provided that you retain all copyright and other proprietary notices contained in the original materials on any copies of the materials and that you comply strictly with these terms.　This copyright permission does not constitute an endorsement of the products or services.　The Open Mobile Alliance assumes no responsibility for errors or omissions in this document.