[texhax] Confused on \let for space

[Doug McKenna]

All -

Quick question based on some kinda TeX primitive/syntax confusion in my 
head:

How does one give a name, using \let, to a space character?  E.g., in

  \let \blankspace =

what comes after the '=' so that, for instance

  AB.C\ignorespaces    \blankspace   D

will be typest as "AB.CD"?

Or am I hallucinating that this \let is possible?  It works fine for 
other non-space characters, e.g.,

  \let\bgroup={


Doug McKenna