Ctrl+Alt+C: cycle forward, Ctrl+Alt+X: cycle backward
1: 2: 3: A Button:
4:
Username: (Ctrl+Alt+U jumps here, Ctrl+Alt+N cycles here)
Password: (Ctrl+Alt+F jumps here, or Ctrl+Alt+P from username field)
Some radio controls:
7:
Username: (Ctrl+Alt+N cycles here)
Password: (Ctrl+Alt+P jumps here from username field)
14: