To answer my own question, this worked:
<cflock name="session.sessionID" timeout="10" type="EXCLUSIVE">
<cfif IsDefined("form.fieldnames")>
<cfloop
list="#form.fieldnames#"
index="field">
<cflock timeout="20" throwontimeout="No" name="Join"
type="EXCLUSIVE">
<cfoutput>
<input type=hidden name="#field#" value="#evaluate("form."&"#field#")#">
</cfoutput>
</cflock>
</cfloop>
</cfif>
</cflock>
I guess that's what I'll use instead of session vars.
H.
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