Manhattan's People module is one of the simplest to understand. Quite simply when the module is enabled, students are able to see each other's "personal info pages" they created by clicking on the View/edit Personal Info button on the "My Manhattan" page that lists their courses. - see View/Edit Personal Info. In addition, once the teacher has enabled the module, all messages in all modules have links back to the personal info page for the person who sent the message.