The Colorfront Express Dailies Dongle is an optional dongle for Express Dailies. Its benefits are an extended license period and the ability to use Express Dailies and all associated third party applications on more than one computer (just not at the same time).
The standard Express Dailies license is issued for three months. The user is sent a notification every three months to renew the license for free. But the dongle, upon activation, carries the license for one year.
The benefit of using Express Dailies on more than one computer is flexibility and safety -- if one machine breaks down, you can switch to another without waiting for a license to be reissued.