A token which must be valid to access non public domain data from the database. An empty string ('') is usually returned as the Token if the is a problem executing a function which requires a Token. 

A valid token contains information about the user who created it:

• Identifier,
• Token Type.

Both a Staff and Student user have type CLIE_TOKEN embedded in the token. This arises because they both come from the Client table.

TAuthenticate Properties