Allow access to OWA only and deny logon to workstations

I know there's a solution for this out there.

I have a set of email accounts that are used for training purposes. New employees must be able to log into the mailboxes for these users, via OWA, to check the emails, but I don't want them to use the training accoutns to log onto any workstations.

In other words, I need these training accunts to be able to access OWA from any workstation, but be unable to log on to the workstations themselves.
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I guess the main question is, how will they be able to access OWA without logging into a workstation, if they are logging into a workstation, which account are they using in order to get to OWA.

In any case the question is a little confusing.  Overall what do you not want them to use or access when they log onto a workstation.
Shreedhar EtteCommented:

Refer this:

and restrict the user to logon to a desktop, then set time windows of do not logon there.

I hope this helps,
RGEIS2000Author Commented:
I don't see the confusinon. Users that can access OWA, but can not log onto Windows. They'd have to access OWA on a workstation that's already logged on.
You might be able to do it by going into the active directory, In AD go into their user properties. On the account tab you'll see a "Log on to" button. Click the button to log onto specific machine but do not put anything in there.

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