Someone recently told me a technology service could "bypass the
stack."  What does "bypass the stack" mean?

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Request for Question Clarification by efn-ga on 28 Dec 2005 19:25 PST

Can you supply any more information about the context in which the
phrase was used?  Computers use more than one kind of stack.

I presume the "stack" in question is the communication protocol stack.
For example, a TCP/IP connection is usually thought of in terms of a
number of layers, starting with the "physical layer" of wires, radio
waves, optical fiber or whatever, and moving up to higher levels of
software protocol. Together these are called the protocol stack.

If you search Google for:

bypass protocol stack

you'll find a few references to technologies that can bypass some of
the layers in the stack. This is just a guess.

Could also be something along these lines:
http://www.phrack.org/show.php?p=49&a=14