This vector will fetch the value of the specified session variable.  These variables can be set using the special options in the input type vectors used with forms.  The values in these variables will persist throughout the user's session.  They will be lost when the user navigates to different website or closes the window.

Examples

{{session:first_name}}
This will get the value of the session variable "first_name"

{{session:first_name|default=John}}
This will do the same thing as the above vector but if no value exists for that variable, it will return "John".