[PD] "canvas" ambiguity (stupid question)

[Matteo Sisti Sette]

Hi,

I always considered a canvas (meant as a pd window i.e. a patch or 
subpatch) and a [cnv] object (the graphical object with a background 
color and a label) as two completely different and unrelated things that 
just happen to be both called "canvas".

Is it so, or is there some more subtle relation between them, perhaps in 
the way they are implemented at a lower level?

Just a curiosity

thanks
m.