IBM VIAVOICE 10-PRO USB EDITION User Manual page 90

To require the Attention word to be spoken before commands, go to the
Dictation tab in ViaVoice Options and make sure the Required check box is
ticked. (See "Setting dictation options" on page 111.) When the Attention word
is specified as "required", you must say it as the first word before every
command, even commands like "Microphone off".
When using the Attention word, do not pause between it and the rest of the
command.
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ViaVoice for Windows Pro USB Edition