Getting around commiting at task to hardware in DAQmx and maintaining HW timing when switching between two AI tasks.

I have a project that requires two HW timed AI task that are triggered at different rising edges. I originally started with an example vi that has HW timed retriggerable AI that seemed to working fine until I decided to capture two channel with a seperate task. I received error messages due to the orginal task being committed to the hardware that prevented the second task for being configured due to reserved resources.
I was able to changed the commit to verify and switched from a analog edge trigger to a digital edge so I could use another PFI for triggering the second acquisition and the program seems to work fine at the momment.
Questions that I have are:
What exactly do verify, reseve and commit refer to in regards to task setup and impact on task switching delay. What information is actually transfered when configuring the task and what are the typical delay times for switching between tasks for the task controls listed above on a PCI6071e card. I am concerned that HW timing may have been sacrificed in order to work around the reserved resources and that if someone bumps the mouse the timing sequence will miss a trigger due to an IRQ.
Any information on this topic would be greatly appreciated.
Kindest Regards,
Bill

Lon,
Thanks for  the reply. I have another related question in regards to configuring the read property node for a digitally triggered start-stop routine with 2 presamples and collecting 5 samples per channel on 14 channels. Triggering occurs at 500 Hz and the total sampling time for all channels is restricted to 500 us max. I am current dealing with a single AI task and having difficulty capturing all the data in an output file. I have tried using a large array to store the data until the test is complete then write the array to a file to see if the file I/O was the problem. It did not work.
I have looked the the vi and information with respect to "How do I use digital triggering to start and stop AI". The description included with the vi indicates that the read property "Relative to" must be set to current read position and the buffer definition modified to something hugh in order to keep the ahead of the write. I have tried this and cannot seem to capture the correct number of bytes in the output file. I have tried different "Relative to" settings and offsets with no luck.
A quick summary of the test is 1000 cycles with 5 samples per channel on 14 channel captured twice during each cycle. Data read as I16 (2bytes). Neglecting the 300-500 bytes in the test comment header,  the file should be in the 112k range (1000*5*14*2*2). When I do happen to collect some data the file size is either way too small or much larger than expected.
All this information to ask the simple question; How do I configure the read properties to make certain that I collect all the data and store it in a file.
I apologize for running on about this problem, but I am getting really frustrated with this.
Kindest Regards,
Bill

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