Enabling SSH login

The Nessus 3.0 Advanced User Guide states: "Nessus has the ability to
log into both UNIX and Windows machines using SSH. This means that
Nessus has the ability to use the local system to query itself for
version information."
 
How does one enable this functionality? 
 
Is it an attribute of a specific plugin that needs to be added? Is it
something I set in the NessusWX client?



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