Insert Janrain Engage into WordPress Theme?

I noticed there is shortcodes for inserting the social login into a page or post. Is there a way I can insert a small amount of PHP code into my theme to do the same thing? Inserting in a page/post is nice, but then you have to do it on every, single page/post if you want it to show on each one. However, putting it in the theme file, makes show up on all pages/posts automatically. That’s what I want to do: allow people to login at the bottom of each page or post, as part of a custom message I display to all non-logged-in users. I assume the widget just uses some PHP, is there a way to get that php to insert elsewhere in the theme? Or even whatever code the shortcode activates when recognized by the plugin.

http://wordpress.org/extend/plugins/rpx/