There are quite a few methods to deliver applications and desktops to end users, in some cases multiple “correct” ways…this leads to some confusion. There also are some new products (delivery services 1.0) that exist but have some limitations today…all good things to pay attention to … or better yet, use Lewan to pay attention to for you.
http://danbrinkmann.wordpress.com/2011/01/24/citrix-receiver-online-plug-in-confusion/