Enroll group of users to course from web services?

Hi!

I am looking to create users, add them to a group and then add that group to a course, all via the web services.

I am already creating new users through the web services api. Looking at the documentation it seems like the following would do the trick:

core_group_create_groups() -- create my group
core_group_add_group_members() -- after i inject a user, i can add him/her to the group

Now, which web service (if available?) is used to enroll a group of users to a course?, or should i be looking at cohorts instead?

Please help