User Management in SAP Web IDE?

Hi,

I'm a little bit lost with SAP IDE. My main problem is user management: I can register a certain amount of users in SAP Web IDE: first name, last name, mail adress, login name (?). So my questions are:

• What is the login name? Is is just a token or makes it sense to assign an S-user name? What are best practices?
• Is there a connection between S-users and SAP Web IDE users? If yes - how does it work?
• The official documentation is stub pointing f.e. to a one hour TechED session SAP ID Service – Single Sign-On for Cloud Applications | SAP TechEd Online. Is there a document describing this?
• Why doesn't SAP send me a starter kit for HCP products like SAP Web IDE?

Best Regards,

Tobias