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limitation of performing retriggerable waveform acquisition using digitizer

In performing retriggerable wave train Ai input acquisition using a digitizer with the Multiple-Record acquisition example, what is the limitaion to the frequency of the trigger used? From the literature, the rearming time for the hardware can be around 1 to 100us so this allows you to capture data if the triggers occur 100us apart (10kHz trigger).  If so, is there any way the digitizer can keep up with the occurance of trigger at 20k Hz performance retriggerable wave train Ai wave train acquisiton?
 
 
There is a way round this with a high speed DAQ card using the retriggerable wave train Ai acquisition utilising 2 counters to gate the generated sampling clock. This avoid the rearming of the software trigger. Is there an equivilent example in NI-SCOPE using a digitizer so that I can perform high frequency retriggerable wave train acquisiton? 
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This is a duplicate forum post. The original thread is being delt with at the following location...

http://forums.ni.com/ni/board/message?board.id=250&thread.id=39780

Thank you

Rich Roberts
Senior Marketing Engineer, National Instruments
Connect on LinkedIn: https://www.linkedin.com/in/richard-roberts-4176a27b/
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