Multifunction DAQ

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Recording data on trigger for unknown time

hello,
I m using NI-5105 to acquire data on single channel using trigger.
I m using ch7 as trigger and recording data on channel 0, using my own (modified) version of the example "MultiRecordFetchMoreThanAvailaleMemory".
I hav acquired data on a trigger of say 10Khz i.e with known time for next trigger(so i can set the "Number of samlpes" to be acquired after each trigger).
1-Now the problem  is that if i want to record data on a trigger  whose inbetween interval is unknown , how can i program that??
2-I dont know how to set the "Number of samlpes" to be acquired after each trigger
3- is there a way that i can start acquiring data on negedge of a trigger and stop on posedge and so on.

seeking help

regards
Umair
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Warm regards,

pBerg
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