[PD] is there a reference of available commands (objects etc) - example "sinesum"

[Lao Yu]

Hi,

I recently came across an example patch that uses in a message box  
the rather interesting command "sinesum". Checking the text search  
engine of the pd list archives gave me some quick answers, however my  
question is

"how can I know which commands exist?"

I mean, nowhere in any available documentation that I could get hold  
of I found a hint that "sinesum" actually exists.

Is there any document that list available commands? I would be glad  
to have a look at it.

Best
J