navigating frames

[Rustom Mody]

I put the following 4 lines in a scratch buffer
--------
(setq fl (frame-list))
(setq cf (car fl))
cf
(prin1 cf)
------------
When I put point on line 1 and give M-C-x, echo-area shows what looks like a 
list of frames

When I put point on line 2 and give M-C-x, echo area seems to show the first 
entry

On the 3rd, it just gives me nil

On the fourth it again shows me something that looks like a frame-spec.

What I want to do is get hold of a frame as a lisp variable and start playing 
with parameters