Questions about \start-ing things with \environment and \project

Hi all...

(I know this is long, but breaking it into 5 separate messages would be
even worse.)


Using LMTX, if instead of \starttext and \stoptext, I have either
  (a) \startcomponent[aaa] Hello \stopcomponent
or
  (b) \startproduct[aaa] Hello \stopproduct
then running context on such a file gives me a PDF with "Hello" in it.

Contrariwise, if I use
  (c) \startproject[aaa] Hello \startproject
I get a PDF with a page number, but no "Hello".


AIUI, when LMTX sees \starttext it does some initialization,
as well as signalling that actual textual content follows.

Q1: Do \startcomponent and \startproduct do the same initialization
    as \starttext, so that I will see the same output, or will things be
    different in some situations?

Q2: Is it "accidental" that \startcomponent and \startproduct work for me
    right now, or is it part of ConTeXt's design that they work like this?

Q3: When one uses \startproduct, does it matter if any \environment
    commands go before or after?  That is, are both of these equally valid,
    or is one The Right Way and one The Wrong Way?
    (a)
        \environment myenv
        \startproduct mydoc
        ...
    (b)
        \startproduct mydoc
        \environment myenv
        ...

Q4: When one uses \startproduct, does it matter if any \project
    commands go before or after?  That is, are both of these equally valid,
    or is one The Right Way and one The Wrong Way?
    (a)
        \project myproject
        \startproduct mydoc
        ...
    (b)
        \startproduct mydoc
        \project myproject
        ...
    
Q5: In addition to \starttext, \startTEXpage, \startcomponent and
    \startproduct, are there any other \start<something> commands which
    signify the start of the text to be typeset?

Thanks.
                                Jim
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