Roller API access?

[Karthik Abram]

How easy or difficult is it to use Roller as the provider of a blog feature 
for a website and get custom access so that one can extract and display:

1) Entries from various blogs
2) Comments
3) Automatically add users to blogs
4) Automatically create blogs for users
Does roller expose an API or is it a matter of observing the internal 
code/database and writing against it?

Thanks