websphere application server -

What is the correct use of this bellow entry in WAS6.1 server.xml. Can you please tell me why we need this "default cookie" and its feature is "safe = false"

defaultCookieSettings xmi: id = "cookie_1282579260990" domain = "" max az = "- 1" secure = "false"

   DefaultCookieSettings xmi: id = "cookie_1282579260990" domain = "" max.ge = " - 1 "safe =" false "/>  & Lt; / TuningParams & gt; & Lt; / Services & gt; & Lt; / Components & gt;  

If I change with safe = "true" then what effect will be

setting will specify that the session is restricted to the exchange of cookies to enable the feature cookies safety zone only HTTPS sessions.