Inviting people with a Direct URL
Instead of using the Vyew Invitation Manager, you can also email people the URL of the Vyew Room, e.g.:
http://vyew.com/room#/12345/yourRoomName
.
NOTE: To use direct URL’s, Vyew Room access control must be set to “Open To Anyone”
Setting Access Control: Open To Anyone
To allow users to come in directly to a Vyew Room without needing an invite, set the “Room Access” to “Anyone with the link:”.
You can then set the permissions level of the users who enter your Vyew Room through the direct URL:
They can view – to limit their access to just viewing. (A Viewer.) 
They can draw / comment – to allow them to view, markup, and comment on content. (A Reviewer.)
They can draw / comment and upload – to allow them to review and upload content. (A Collaborator.)- Click on “More Options” to be able to assign users Moderator privileges.
More about User Roles/Permissions.
How to set a password on a Vyew Room
Set the “Room Access” to “Private – only invited users”, then check “or people with this password:” and enter your room’s password in the box.
How Sync Mode affects Viewer Permissions
You should also be aware that a book’s Sync Mode affects whether a Viewer user role can navigate or not. Please read this section: “How Sync Mode affects Viewer Roles“.