[PD] PD signal graph

[Thomas Grill]

Hi all,
before i dive into the swampy depths of the PD source code... maybe someone
can answer this ad lib:
I'm still not completely sure whether insertion of new signal objects into a
patcher is guaranteed to be click-free. Therefore a basic question:
Is there a global signal graph in PD or are there many local ones (e.g. one
per patcher) and what (e.g. which objects) are the nodes where these
interconnect?

many thanks!
Thomas