1.) If the data is coming in separate files, use the 'List directory' function to find out when a new file arrives. Then just read it using one of the standard functions, (i.e. Read txt file.)
2.) IF the data is being appended to a single file, use Open/Read/Close file functions. The read function will give you an offset value which tells you how far into the file you have read. Put that value in a shift register and then you can start reading where you left off when the file is updated.
I hope this helps.
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"There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only by God, the Creator, made known through Jesus." - Blaise Pascal