In order to install on line documentation and help, although there are
alternatives, preferred way is (on a PC with Windows-95) as follows:
* Put the file InvariantsSymmetries.m into
C:\Program Files\Wolfram Research\Mathematica\
4.0\AddOns\Applications\Integrability
* Put the file init.m into
C:\Program Files\Wolfram Research\Mathematica\
4.0\AddOns\Applications\Integrability\Kernel
* Put the files BrowserCategories.m, IntegrabilityPalettes.nb,
and Documentation.nb into
C:\Program Files\Wolfram Research\Mathematica\
4.0\AddOns\Applications\Integrability\Documentation\English
* Start Mathematica 4.0, Select "Help" from the main menu, and then select
"Rebuild Help Index" (done only once for every addition to the system).
Then choose "Add-ons" under the "Find in Help" item and you will see the
item "Integrability" listed there.
On other systems put the corresponding files into appropriate places under
AddOns directory.
* In any Mathematica notebook you can read in the package via the
Needs["Integrability`InvariantsSymmetries`"]
command and learn about the functions via e.g.
??PDEInvariants