Microsoft Knowledge Base Article 306496 contains the following summary:
By using the Solicited Remote Assistance feature in Microsoft Windows XP, you can explicitly request
help from another party by using a
method such as e-mail or Windows Messenger. This article describes how to
configure or disable the Solicited Remote Assistance feature through Group Policy settings.
Note Perform the following steps on the novice computer, which is the computer that belongs to the user who is requesting the remote assistance.