BuddyPress.org

In BP 1.0.3 (running on WPMU 2.8.1) the new user signup process seems to go like this:

1) User fills in web form

2) an activation email is sent to the user with a link

3) when clicked the user is taken to the website which triggers a second email sent to the user with their username and password. This email invites them via another link to log in.

Is it possible to:

a) edit the text of these two emails?

b) control what email address these two emails are sent from (currently for me they come from a shared server account address at bluehost)

c) edit the text on the pages shown to the user after they fill the web form, and also when they click the link in the first of the two email messages described above?