Casio DT-X100 Series Software Manual page 18

(7) Side trigger key input interrupt disabled
The input interrupts assigned to the left and right trigger keys can be disabled.
If they are disabled, input from other keys can be received even while a side trigger key is pressed.
This function prevents inadvertent pressing of the side trigger keys, which are placed on the sides of
the case, by the hand that holds the case during numerical keypad input, because such trigger key
operation disables numerical keypad input.
Setting can be made from the application by using a system library.
For details, refer to the System Library Manual.
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