In the play Waiting for Godot by Samuel Beckett, what is the purpose/significance of the character "the boy"?

The boy is the messenger in Godot. There are two identical
boys in the two acts. They come to announce the fact that Godot will not arrive. The two
boys constitute yet another confusion in the form of the operation of the double, which
is a general pattern of the play.

The two boys are
important in the sense that they expound Beckett's un-knowing subjectivity quite
perfectly. Their patent answer is 'I do not know'. Beckett exploits a horrific as well
as comic flatness and mechanical quality through their
speech.

They also stand for an enigmatic innocence,
especially when Vladimir loses his cool and abuses them. As Vladimir's words clarify,
they also offer a subjectifying gaze for the two tramps to establish their
existence.

The two brothers are like Cain and Abel and
their dialogues about Godot's abode and his supposed treatment of them as well as their
respective professions under him--all point to a seductive Christian symbolism,
built into the play.