Query Windows Explorer and/or broser?

I´m writing a C#/.NET application. Finding out if Explorer sessions are active is quite easy (same for browser sessions):

#using System.Diagnostics

public void FindExplorerSessions() {
   Process[] explorerSessions =
      Process.GetProcessesByName("explorer");
}

Is it possible to iterate through that array and find out which subfolders are currently open in these sessions?

And on a related topic, is it possible to find out which URL(s) are currently open in a Chrome/Firefox/whatever session?

Possible use for the browser stuff: monitor the time spent on 4chan per day/week/month (assuming that the monitor app is always running and the user closes the 4chan tabs when he is doing something else).

Well, I´m aware that such an app would be considered kinda spyware, but actually I have users requesting this feature (they want to have a reminder which tells them to get the fuck off 4chan after a couple of hours and do something productive).

http://www.clickondetroit.com/news/29271312/detail.html
A Wayne County employee was suspended from her job after making a few Facebook posts about her frustrations with her work.

Cody said she meant no harm by making the post and that she did not think anyone at her workplace would read it.

She said her Facebook page was private. However, one of her Facebook friends worked at the probate court. That person printed out the posts and showed it to Cody's bosses.