The Transaction class is a collection of shared methods that allow control of transactions, specifically global transactions.
There are no System or Transaction objects, per se. That is, you cannot instantiate an instance of a Transaction object, nor assign references from one variable to another, nor are there any instance-specific methods in this class. You can, however, declare objects of the Transaction class. The main use of such objects is to provide a short-hand way of referencing the class:
%sys is object system %tran is object transaction ... %tran:setGlobal(%xid, $view("JOBNM"))
All Transaction class methods are shared methods, so they are invokable via their class names:
List of Transaction methods
The individual Transaction methods are summarized in List of Transaction methods.