[erlang-questions] The Trinity: ERTS, Emulator, Shell

[Avinash Dhumane]

Where may I look further for the basic understanding of spatio-temporal  
relations among the "things" named as ERTS, Emulator and Shell? The  
question occurred while I was toying with "erl" as Unix-filter  
shell-command and couldn't get over the options (to erl) like "-noshell",  
"-s", "-detached", init:stop(), and so on in the documentation and in the  
FAQ.

Thanks