### Token Readers

The Sun Ray architecture utilizes tokens (authentication keys) which are typically presented via smart cards. Some manufacturers print the token identifier on the card itself, but many do not. Sun Ray Server Software provides a way to designate one or more specific DTUs as dedicated token readers. Site administrators can use these token readers to administer Sun Ray tokens, for example by assigning a token to a user (token owner).

A DTU configured as a token reader can retrieve and display the token identifier of any smart card inserted in it. However, inserting or removing a card does not cause hotdesking to occur as it would on a DTU not configured as a card reader. Instead, any session connected to the DTU remains connected to that DTU regardless of card movement events.

You can configure a DTU as token reader with the `utreader` command or from the Admin GUI. (Select the desired DTU on the Desktop Units tab, click the Edit button, then check the Token Reader checkbox on the Edit Desktop Unit Properties page).

Note – You must restart Sun Ray services to activate a newly configured token reader.