var et_cdi
With the help of the etracker parameter et_cdi, a value (identifier) is transferred which is used to identify the website visitor using cross device tracking.
var _btNoJquery
There is the option to disable the loading of jQuery by setting the parameter var _btNoJquery = true; in the parameter block of the etracker code. However, this only makes sense if a jQuery loads on the website anyway as smart messages and A/B tests cannot be exported otherwise.