Opening large files for small amounts of data

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When I open a file in VB, what really happens? What I mean is that I
may have a file on a remote server, but still inside of our network,
that can be over 1 GB in size. If I just need to open it to append a
small amount of data to it, how much traffic over the network really
occurs?

How about for reading a couple of lines from that file (say the last 2
lines)?

Are there things I can do to make sure that I can get the fastest
access times?

How does a computer actually "Open" a file, and how much data is sent
at that time?

I am so ignorant in this area that I'm sure I'm asking stupid
questions, so if anyone can point me to some information that would be
great. I didn't have that much luck when searching.

Matt

.

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