[PD] usage of gems

[av]

hi list,

how can i record the graphics from gem
to a file (quicktime), is it possible in pd,
or maybe a desktop grab utility?

also, i wonder if there's any docu on gem
delaing with the arguments of all the objects/externals.
i have a big list with all of them, and their function, but not the 
arguments.
(in max you just point to an inlet and its at the bottom of the window,
in supercollider its command-j and you see the class source,
for pd i dont know).
and did anyone use gridflow for osx already? experiences?

thanks as always,

adrian