I have installed the spider program from Ward . It empties the famous fiel index.dat in directory Content.IE5

After running the program then I noticed that the webpage http://crl.verisign.com/Class3CodeSigningCA2001.crl is visited.

Does anyone knows what this Class3CodeSigningCA2001.crl is doing?
http://crl.verisign.com is what?

Thanks for reaction
Worldbird