Sony PCG-K415B User Manual page 44

S1 button :
The S1 button, by default, launches VAIO Zone. You also can link another action that you execute often to this shortcut button.
See Setting up your computer with VAIO Control Center
Troubleshooting special buttons (VGN-A series)
Pressing the Magnify button does not change the screen resolution
If the default resolution has been changed using the Display Properties window, pressing the Magnify button may not work.
Change the resolution to the default one in the Display Properties window, and then use the Magnify button.
When the software that places high load to the CPU is running, pressing the Magnify button may cause a malfunction. It is strongly
recommended that you should not use the Magnify button while such software is running.
(page 26).
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Using your VAIO computer