Prioritizing messages in PI

Hi friends,

I have to priorize some messages in PI 7.02 but I'm with some doubts.

First of all, I'm following this doc: http://scn.sap.com/people/community.user/blog/2005/12/12/how-to-prioritize-messages-in-xi

My doubt are:

1- I have to set low priority to the queue XBTR but using this doc, this queue is not visible as Queue prefix.

3- How to create a new queue?

2- How can I know, how PI set messages on a queue or on another?

Thank you so much.

Luciana