ColdFusion using Query String parameters

>> but what I don't know is how to hide the results from the user
Not sure what you are doing, but perhaps you need hidden variables:
<input type="hidden" name="myFieldName" value="#url.theFieldName#"/>

The SSO.pdf is a bit strange because the examples do have typos and use the same string as auth= key and the session key.
From the description I read that the session key is generated for every use as a new key and valid only for one ´session authentication. Therefore there is no need to hide the Session key.
Big care is to keep the auth= key secret but that auth key handling has NOT to go to browser. It has to be handled completely on ColdFusion side.

Thanks for the information Zvonko:

What I am stuck on is how to grab the returned auth key and store it as a session variable that can be used to redirect the user.

See my code below. (note I have hidden our key information etc)

<!---Digital Storefront Code--->
 
<cfif IsDefined('Sesson.AuthKey')>
<cflocation addtoken="no" url="http://print.redleafdigital.com/***/login.aspx?key=#Sesson.AuthKey#">
<cfelse>
 
<dd class="bodytext"><img src="../SiteImages/new.gif" alt="New" width="37" height="24" hspace="2"><cfoutput><a href="http://print.redleafdigital.com/***/SSO.aspx?user=#Session.SuNameKey#&company=**auth=****-****-**-****-****">Customized Holiday Cards</a></dd>
</cfoutput>
 
</cfif>
 
<!---End Digital Storefront Code--->

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Excellent, Thank you!