Post installation

Hi, I have currently running weblog and phpbb and would like to convert to drupal.

My question is if it is possible to assign different virtualhost for each type of content
while using single database.

Let's say my domain is foobar.com and I have blog.foobar.com, phpbb.foobar.com.
I want to migrate these data into drupal using single codebase, database with
using the same virtualhost name(blog.foobar.com, phpbb.foobar.com)

How do I mark all the unread contents as read?

phpbb has this kind of functionality: 'mark as read' per forum or for the whole site
but I couldn't find such at drupal yet.

And is there any way to show all of the unread contents from single place?

Thanks very much.

From within a module (in this case a node), how can I determine the role of the user viewing the node?

How can I change an existing forum topic to other type of content like blog node or story node... with all the comments as the same?

And how can I modify a whole forum category(for example, the 'suppport' category of this forum or the whole 'how to I...' subcategory) to other type of content like above?

I think if a user with proper permission can change it via 'edit' tab or category admin interface or outside module, it would be great.

I'm trying to convert from phpBB to the Drupal forum module, but I'm not finding any way to replicate most of the features I like in phpBB. The biggest one so far is limiting access AND visibility of certain forums and categories based on user role. Is there any way to do this using the forum module?

I love the context links module, but I recently ran into a problem. I found a new icon for the external link class that I like better than the one that came with it. I placed the new file in the contextlinks/images directory with the other images (just to make it easier) and edited the class to point to the new icon. Great! So, I refresh my site... and the external links still have the old icon. I create a new test post, and voila... the new icon is there. So I go in and edit an old post, change the link class from "external" to "link" and save it.