For help with using the different functions of SNFClient, you can run SNFClient.exe with no parameters. The result is something like this:

>SNFClient.exe

Help: 
 To scan a message file use:
     SNFClient.exe [-xhdr] [-source=<IP4Address>] <FileNameToScan>
 or: SNFClient.exe <Authenticationxx> <FileNameToScan>

 To test an IP with GBUdb use:
     SNFClient.exe -test <IP4Address>
     
 To update GBUdb records use:
     SNFClient.exe -set <IP4Address> <good|bad|ignore|ugly|-> <badcount|-> <goodcount|->
 or: SNFClient.exe -drop <IP4Address>
 or: SNFClient.exe -good <IP4Address>
 or: SNFClient.exe -bad <IP4Address>

 To check SNFServer status use:
     SNFClient.exe -status.second
 or: SNFClient.exe -status.minute
 or: SNFClient.exe -status.hour

 To shut down the SNFServer use:
     SNFClient.exe -shutdown
     
 For more information see www.armresearch.com
 C) 2007-2013 Arm Research Labs, LLC.