Workflow with conditions

Hi...

I'm find out how to implement my scenario with or without programming a module. I'd like to make it using the current Drupal modules.

I appreciate any help... this is my scenario.

I've migrated from D6 to D7 and I'd like to implement some new procedures and polices.

Previous scenario:
1. The anonymous users could add content in two content types. Each content type has their path or URL
Content Type A: http://example.com/a
Content Type B: http://example.com/b
2. Once the anonymous user submit, these content must be approved by the administrator.

New scenario (I'd like to do)
1. Every time that the anonymous arrive to http://example.com/a and/or http://example.com/b. He/she must be register and/or signup
2. There are two rules: Editor_A and Editor_B. The registered user belong to Editor_A or Editor_B according to the URL he/she arrived (http://example.com/a to Editor_A and http://example.com/b to Editor_B)

So far I know about Drupal:

1. What is the Rule event which launches the anonymous reaching a specific URL?
2. How the User can be registered to a role by the URL?

Any help will be thankful.