VPP bought software -- WHOSE appleID to install the software?

Question

We are setting up a VPP account (or at least attempting to...  The links in the VPP documentation lead to apple pages where VPP appleIDs are prohibited).  And we don't quite get how this works.
-- we have set up an email in our domain especially for VPP purchases.
-- we have followed the links on the VPP page to the screens to set up an appleID for that email address.  (It was a little strange, in that it asked for a birthday, but then we can't put in a date in 1837, which is our 175-yr-old company's birthday.  And coming up with a security question whose answer would be known by other employees if the sysadmin gets hit by a bus, but would not be easily looked-up in google, is pretty challenging!)
Before we invest any money in buying software, we have some questions:
-- According to the docs ( http://images.apple.com/business/docs/VPP_Business_Guide_US_6_4_2012.pdf which I downloaded a few weeks ago but is now a dead link) we use our company appleID to buy some software.  For example 7 copies of Keynote for our seven salespeople.  We get a code that can be used 7 times to download Keynote, or 7 codes, or something like that (probably not important) which we send out to our 7 salespeople.
-- Ok, here's where I'm stumped:  the docs say that the seven salespeople use "their" appleIDs to install Keynote on "their" computers.
Email the redemption URL directly to users. Users simply click the URL, either from their mobile device or from a Mac or PC. iTunes opens the app page in the App Store. The redemption code is automatically entered, enabling users to immediately download the app after authenticating with their Apple ID.
So, first of all, these are not the employee's computers, they belong to the company.  So WHO is this "they" that the documents refer to?  Is this telling you to use a company appleID -- the VPP account appleID?  another appleID where we set up a separate one for the employee? -- that we use to load software on the company's computer?  Or does it expect that the employees will put in their own personal iTunes/AppStore appleID?  When there is a software update for software bought via VPP that needs to be installed on a company-owned device, how does the employee get access to the update?  What's the appleID and what's the password?
Should I be setting up an  appleID for each device, so that when an employee leaves and a new hire takes over his/her computer, responsibilities, and software, the new employee also gets that device's appleID to manage the software, too?  So I need to set up emails for [email protected], [email protected], etc.?  What happens if employees have their job responsibilities changed in a way that requires software to be re-arranged?  So sales1 has software A, B & C, while sales2 has software X, Y & Z.  After the reorganization, one sales person needs A, B & Y and another sales person needs X, Z & C.  Can I even get the software moved from one machine to another?  If I can, will the two sales people both need the passwords for sales1 AND sales2 to run updates for all three of the software titles on their machines post reorganization?
We are pretty confused by all of this.  Does the fact that the http://www.apple.com/business/vpp/ page has a link to " Download the Guide " which used to lead to a pdf document and now leads nowhere mean that Apple has figured out that whatever scheme they have set up won't actually work?

Answer 1

Welcome to Apple Discussions.
If the new version has an uninstaller run it first. Othewise with Mac OS drag the app to the trash and empty the trash. Do an install if a dialog box asks if you want to replace or keep files with similar names choose replace.