DMDX Help.
No NTN Prompt Keyword
<NoNTNPrompt [N]>
<nntnp [N]>
     MDSP bit 100000 modifier.  Reset if N = 0, otherwise set.  All MDSP modifiers are both parameters and switches.  If N is missing the bit is set and the mode is active.  Setting this MDSP bit stops Naming Task Negation prompts from being displayed on the subjects display in a single monitor system and instead clears the screen -- meaning the experimenter must know that DMDX is waiting for naming task negation input at the right time.
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