setup security token service in SharePoint 2010

hello,

im trying to setup token service in sharepoint 2010 following this document http://technet.microsoft.com/en-us/library/ee806864.aspx, im unable to give the "path to cert" mentioned in the document can anyone please tell me how to give the path to this ?. Is token service related to FBA in 2010 in any way ? thanks

$cert = New-Object
System.Security.Cryptography.X509Certificates.X509Certificate2("path to cert file")

secondly does this security token service is knows as FBA in moss 2007 ? or moss 2007 does not have this feature ?

thanks..