How to blog via url

How to blog via url: "to blog via url"
The base URL is
http://www.blogger.com/blog-this.g

a form will be displayed to enter Title of the post and edit post content.
a Google account / login is required to actually post to the blog.

You can pass the following parameters:
Post Title(n=...), Body(t=...) and URL(u=...) for link back to the source. The url must be a valid url (including schema, like http://regmagik.com/...)

use plus sign + instead of spaces.

Here is a sample URL with parameters:
http://www.blogger.com/blog-this.g?u=http://regmagik.com&n=How+to+blog+via+url&t=I+blogged+about+regmagik

But how does it know what blog to post it to? It never asked me to choose a blog. Perhaps it is somehow linked to my account? Here is another URL that includes blogID:

http://www.blogger.com/post-create.g?blogID=9633914