Glink uses any of the standard iOS keyboards configured. The keyboard configurations are is found in the iOS Settings app in the General-> Keyboard section.
When using an external keyboard, in the Glink main screen, select Menu-> General options-> Keyboard up on. Glink will then be ready for keyboard input when connected to a host application (otherwise you must tap at an input field first).
Glink support several keyboard shortcuts for function and control keys. To display a list of these shortcuts, press and hold the cmd key until the list is displayed. See also: Keyboard shortcuts
Keys can be mapped or remapped, select Setting->Keyboard mapping option.