Thanks for Marc and TJ for their replies to my previous and an example from Marc from a real project.
As I look more into gambit-c system, I find more questions.
In ~~/examples/misc/signals.scm, there are these function-like stuff: ##interrupt-vector-set! ##os-getpid
In many other examples, I see ##namespace, ##include, ##time, ##gc etc...
Then, I could not find any info about these ##xyz in gambc-4.0b22/doc/gambit-c.html
Are they documented somewhere ??
thanks HP