You share documents with other members of your workspace by providing an access to a folder with your documents. Go to Folder and click on Folder Properties.

Select a Security tab. It allows you to view and/or change the level of access to a folder through the system of Folder Permissions. By default all folders are shared between members of your workspace.

Start to create a Permission list. To add a member to a Permission list, click Add, select the name of a member for whom you want to set permissions and then click OK.

Then set up Folder Permissions for each name in the list. Click the Name of the member. In Permissions, click Allow or Deny for each access level you want to allow or deny. After you have set up permissions for all desired members of your workspace, click OK.

Since you can create many folders, you can have one folder for a project team, another folder accessible by all members of your workspace or a folder totally closed to everyone.

Open a Document that you intend to share and click on Mail. Type in the e-mail address of an external user or select an address from the Address Book. Write a message and click on the Send button.

The link to your document has just been sent. The external user does NOT need to open an account or pay any fee to access the shared document.
He receives the link in his e-mail box, can view the document, open or download attached files and added web links.
Please note that the external user will not see your other documents or know that they exist.

The external user, however, can add notes and remarks to a document (Add Comment). This can be useful as a discussion forum or an opinion poll.