Honeywell Thor VM3 User Manual page 260

The following key press sequences are not programmable:
To get this function
Increase speaker volume
Decrease speaker volume
Increase display brightness
Decrease display brightness
The Blue plus P3, P4 or P7 key press sequences cause no action.
250 Thor VM3 with Microsoft Windows 7 or Windows Embedded Standard 7 User Guide
Press These Keys in this Order
Blue P1
Blue P2
Blue P5
Blue P6