Hello everyone
after a long time, as they say here, I thought I owe you this:

1- The most basic sitting meditation attitude `"Parimukha.m sati.m
upa.t.thapetvaa".
Usually rendered as `having established one point mind fullness' (on
the upper lip) is not a bad technique
But I fail to see how concentration on a point can be also a
concentration on the breath,
So we figure it means something like: `All around mindfulness' and
even
`Inquiry into all facets of one's reality'.
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May 2008 additional note:
As I was this year in Na Uyana Aranna Senasana, in the teachings of
Pa Auk Sayadow , the point is made clear:
A concentration on a certain bodily point, it's sensations and that
development is considered as four elements meditation' which is of
the kayaanusati- the base of mindfulness of the body,
But it is not `mindfulness of breathing' AnaPanaSati which belong to
the same category of
Observation of body phenomena..
AnaPanaSati, is an attention to the concept of the breath. It is
important to see it, as only so the
Idea of the body of breath' the full unit of one aspiration, or one
exhalation can be seen as a `body' , to be inquired into by
mindfulness, as to it's beginning, continuation, end.
Any lapse in attention may be a call for the healing investigation-
process of Samatha.
But `seeing the forest' the general conditioning of existence that
our simple problem exemplifies
Will open the way to understanding that all is conditioned,
all is `anicca, Dhuka, Anatta.
That we are caught up in Samsara, this is awakening.
jothiko
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In that context `PacchaPura' = `back and front' of the body,
As particular investigations are made into `dead spots' in a more
detailed way
Than meant by `Parimukha.m" ='all around'.
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May 2008 additional note:
PacchaPura is also the reastablidhment of the former situation, the
way it was before.
(this one is im debt to Gampaha PemaSiri MahaThera of Kanduboda.)
In the Parajika explanation of the PatiMokkha it is the return of
the offender to lay life,
No apperent harm to anyone…

Here it seems to be the return to the inquiry based Satipatthanaa
or `DhamaVicaya, or Vipasana (really, no harm)
The simple wisdom that does not involve the miraculous achievement
or the states that are beyond the senses that quajify as Samatha,
and in our case particularily the IddhiPada
jothiko