camVariableManager usage

Good day, community I got a simple question:

Is the camVariableManager, used in the participating lifecycle section, able to fetch all the variables on the form to process them? Do I have to refer to the id or name attributes of the variables to join them?

What I mean is: if this variable manager, can join all variables or I have to declare them one by one to avoid any possible missfunctionality when gathering all data from the form at the submit moment.