Ok, finally figured it out.
iFrame URL:
htp://events.domain.org/events/events.asp?details=true
WordPress Page URL:
htp://www.domain.org/post.php?p=1083&cale_id=246
iFrame Shortcode:
[advanced_iframe securitykey=”key” url_forward_parameter=”cale_id” src=”htp://events.domain.org/events/events.asp?details=true”]
This seemed to do the trick.