How to get the last data point from a TDM file in LabVIEW?

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Hello,
I am using LabVIEW to analyze some rather large TDM files, and I need a way to get only the last data point.  So far, the only way I have been able to accomplish this is by reading the entire file.  Is there a property in the TDM file or a function in LabVIEW that will allow me to get the index of the last item in a channel?  
Thanks!
Christina
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Do you want to avoid reading whole file and want to be able to reach or get the index of last value of channel? is there any specific reason? I am not sure you could do it without loading the whole file. But the easiest way would be just to use array functions "array size" would give you the index of last element. 
-Nilesh
Kudos are (always) welcome for the good post. :-)