Username Discovery

Hello list,

Is there a tool on the market to audit a non-centrally controlled
(every user is the administrator of their own box) network for all
Windows usernames? In other words, is there something that can be used
to harvest the Windows logins that are residing on Windows boxes to
determine who is using the network but also to possibly plug into a
script to quickly iterate through the network to test for blank or
inexcusably weak passwords?

Thanks,
John

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