Greg,
all the registry-entries are for "convenience", that is: to make it
possible for the installer to check if PostgreSQL is installed.
So to use PostgreSQL on Win32, simple distribute the files found
within <programs>PostgreSQL/8.1/ from a normal installation. ["normal"
is quite a challenge nontheless, as "normally" client & server libs
are distributed; together with PG-Admin in default installation]
Your challenge in not using the installer remains:
a) arranging the path correctly so that all libs are found
b) creating a user with appropriate privilges
[in corporate environments that is often better done
by whatever user administration tool they use]
c) creating the service [check pg_ctl --help]
d) initialising the datadir (initdb --help)
I tried to went down that road because of problems with earlier
pg-installers (8.0.0 beta and before); and it was harder than it
sounds, so I moved back to the installer. I recommend to you to do the
same - or report back your sucess.
On http://pgfoundry.org/projects/pginstaller/ you can find the source
to the installer; to recheck what exactly that MSI is doing; maybe
Installshield is even able to "include" the MSI definitions from there
(they are made for the "free" tools from MS to build installers)
Best wishes
Harald
--
GHUM Harald Massa
persuadere et programmare
Harald Armin Massa
Reinsburgstraße 202b
70197 Stuttgart
0173/9409607
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PostgreSQL - supported by a community that does not put you on hold