I need to force a mini web page to appear on the toolbar

[Webmaster]

I need to force a mini web page to appear on the toolbar when I send
something on my end. Not sure how to do this.

[Admin]

There are 2 Parts to be configured:

Your side (server-side)
1) You need some php(asp, etc.) manager on your server with users
toolbar_ids.
2) If you want to send a message to some of your users - you should
select toolbar_id from list (for example) and write some message
3) You need some message-generating script that will generate
include_xml page according to toolbar_id and you message. (Generate
xml with your message in banner if users toolbar_id=toolbar_id that
you have selected)

User's side:
In toolbar you need to add Dynamic XML with s path to your
xml-generating script (i.e.
http://www.yoursite.com/xml.php?toolbar_id=%toolbar_id)
This include_xml should refresh every minute.

So if you write some message user will recieve it in 1 minute.