Command Line to start Published Package install?

[shootist321]

The problem is I'm supporting ~200
systems, and some have the new version of the software, and some have
the old version. I'm trying to keep from running around to all the
systems and uninstalling/installing anything. I want to do this via
the GPO. Since the old version was not installed with the GPO, I have
to use a logon script to uininstall the old version. The new version
that SOME systems have, also weren't installed with a GPO, so i have to
use the logon script to uninstall those as well.

So here is what I need to do, IN THIS ORDER.


Logon script to uninstall old version of software <--I know how to do
that
Logon script to uninstall new version of software <--I know how to do
that too
Logon script to THEN invoke the Published Package of the new version to
install. <--THAT'S what I need to know how to do.


I can easily program the logon script to install the new version, but
then for the future, I wouldn't have any control over it with the GPO.
So I want the logon script, instead of just starting the installation
by pointing to the exe or msi file, I want it to kick off the Published
Package install (which is normally done by going to add/remove
programs).


Any ideas?