<message_body>
<pm:set_global>
<project_path>/</project_path>
<param datatype="i" name="aarrg">abc</param>
<can_override>Y</can_override>
</pm:set_global>
</message_body>

An addGlobal message is sent by a client application or another cell service to add a global parameter to the PM cell.
The domain, username, and password are sent in the header of the message so it does not need to be sent separately in the <message_body>.