ncrack at=50? why at=50 what that means??

michael johns <[email protected]>
Newsgroups gmane.comp.security.nmap.devel
Message-ID <CALmnBC=U4zwZ_ngKRjbG+GtDS5Z_XUKk42QBvoLbSnE5eKS_7g@mail.gmail.com> 
ncrack at=50? why at=50 what that means??be more specific please.I use
synatx without ''at'' and works fine whyor when i need ''at''?

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