URL to pass variable, but how to keep it secure?

Hi,
I have created a login to a website. Some users can download
an application. Those who can will receive a link that says
"Download". I need a way to make the URL to the download private -
so those who aren't supposed to have the application can't simply
type in the url and grab it. My question is, how can I create a URL
that is dynamic?
Thanks,
Amy

Sorry, let me be more clear. This is what I have:
<cfquery datasource="myDB" name="qryLogin">
SELECT username, userpassword, userrole
FROM userinfo
WHERE username = '#form.username#' and userpassword=
'#form.userpassword#'
</cfquery>
<cfif qryLogin.recordCount gt 0>
Login successful. Welcome <cfoutput>
#username#. </cfoutput>
<cfset SESSION.isLoggedIn ="yes">
<cfif "#qryLogin.userrole#" eq "0">
</cfif>
NEED ABILITY TO DOWNLOAD HERE
<cfelse>
Blah blah blah, you can't download.
</cfif>
<cfelse>
That record does not exist. Please try again.
<cfinclude template="login_form.cfm">
<cfabort></cfif>
<cfif not isDefined ("SESSION.isLoggedIn")>
Please log in.<cfabort></cfif>
So how do I fix this?
Thanks for your help!
Amy

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