Basket area; $oxcmp_basket object, how does it produce its values?

Hello Team,

$oxcmp_basket, a Smarty variable to be found in a template, basketcontents.tpl.
I studied some code, my assumption was $oxcmp_basket its values are taken from session. This variable, it plays a major role in displaying prices of items and basket price calculation.

My question is $oxcmp_basket, how does it produce or obtain its values?

Thank you.