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Functions for communicating with Pageant, the basic windows ssh agent program.
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Check to see if there is a "Pageant" agent we can talk to.
This checks both if we have the required libraries (win32all or ctypes)
and if there is a Pageant currently running.
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Communication with the Pageant process is done through a shared
memory-mapped file.
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Mock "connection" to an agent which roughly approximates the behavior of
a unix local-domain socket (as used by Agent). Requests are sent to the
pageant daemon via special Windows magick, and responses are buffered back
for subsequent reads.
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