Populate and Display members across contexts

Im developing a site with three different contexts. Each context represents a different domain but the 3 websites are of the same business. My questions are:

1. If I have a Register snippet (Login) accepting signups to a UserGroup will all new members regardless of Context be found under Security>Manage Users and be filterable by UserGroup drop down?


2. Is there a way to output members of a UserGroup (and their details) on a resource and allow a client to export these details to CSV?
   

Thanks

#1 - YES, all users will be contained and are manageable in the one MODx manager no matter what context....


#2 - Install the Extra, Peoples
Make this call
[[Peoples? &limit=`600` &tpl=`MembersListTpl` &sortBy=`username`]]

-And since users and groups are not demarcated by contexts, they will all show up when called.
-Use CSS to fix up the presentation as you want in the Tpl
-Can also place Tpl in Table form. <table></table> etc.
-There are plugins for exporting html to CSV, search for some in Google.....