Is cflock necessary when using #Session.URLToken# to append CFID and CFTOKEN to a URL?

Title pretty much says it all.  I'm in the process of making my application friendly to folks without cookies.  The site uses a login.  I'm in the process of appending Session.URLToken to every URL and form action, to track a user session without cookies (if necessary).

Do I need to place a CFLOCK around EVERY code block that contains a URL, since I'm referencing a session variable?  I assume not since that would be utterly impractical (plus I'm not modifying any information)... but I thought I should check, 'cause if I'm wrong there's probably potential for all SORTS of issues here.

Thanks!

Joe