Você pode usar (Windows 7)
Ctrl-Shift-Esc - Starts task manager (Activate Applications Tab if necessary)
Start typing - selects an application (by window caption)
Enter (or ALT-S) - activates the application
Apenas tentei em casa (Windows 8.1) e o processo é um pouco mais confuso infelizmente
Ctrl-Shift-Esc - Starts task manager (Activate Applications Tab if necessary)
Start typing - selects an application (by window caption)
Right Arrow - Expands the process
Right Arrow - Navigates to the window of the process
Enter - activates the application