[luatex] Hash tokens meaning

[Sensei]

Dear all,

I am trying to grasp the meaning of the hash tokens I find in a latex 
document. I am a novice TeX user, so please bear with my (almost surely) 
stupid questions: I've only used LaTeX, and never looked into the pit :)


- First of all, I find many tokens that contain @ or ! or ^, for example 
"tagsleft at false", "ps at headings", "\T1\^-\i", or "!!stringa": do these 
characters have a special meaning?


- Why do I have so many "blank" tokens? At the end of this you'll find a 
sample from a dump file viewed from emacs, so an encoding of special 
characters is visible.


-Are tokens as 
"<5><6><7><8><9>gen*cmbx<10><10.95>cmbx10<12><14.4><17.28><20.74><24.88>cmbx12" 
real, or is it some kind of "encoding" that I see?


- Are these tokens portable? I mean, a friend of mine on windows will 
produce the very same tokens with the same document?


- All \label{something} seem to be processed as token "r at something". Is 
this real, or just my imagination?



Again, I am sorry to ask such trivial questions, but I didn't find 
anything anywhere on the internals of TeX!


Thanks & Cheers!



===BEGIN===
luatexattributedef
sffamily
^A
tracingoutput

^H
^K
macc at palette
^M
^L
^N
@currdir
makesm at sh
pdftrue
?\textless
====END====