Symbol Technologies DS 3408 - Manual (Page 315)

Advanced Data Formatting 15-83
Send Graphic User Interface (GUI) Characters
The “Send Graphic User Interface Character” actions will tap the specified key while holding the System Dependent Graphic User
Interface (GUI) Key. The definition of the Graphic User Interface key is dependant upon the attached system:
Send GUI 0
Send GUI 1
Send GUI 2
Send GUI 3
Send GUI 4
Send GUI 5