Hi,
I think the best way is to install a wims-server on your intranet.
That way you have:
– total control over the system and the system logfiles
– high bandwidth
– high availability
– raw ip-adresses and MAC numbers are available if you are « root » on such system
– monitoring/tracing of fraude is easy
– use automatic updates for modules
There are a two possibilities, depending on the amount of support/cooperation you can get from you local IT-managers (…)
1) Intranet server is not usable from the internet.
– use a public/free wims-mirror for homework
– manually synchronise with your intranet server
– automatically synchronise with your intranet server (raw connection)
2) Intrantet server is usable from the intranet
– the best solution
– install wims on your internet gateway or use a separate computer in DMZ (…)
– no need for mirroring.
– internet adress is used for just homework ; no high bandwidth needed.
– schoolwork/wims-lessons on intranet : high bandwidth needed
On our school we use the Leiden mirror primarily for homework and sometimes for schoolwork.
The « scores / total studytime / effort » on the internet server are used indicative: but they can influence a « real score ».
We use an intranet server for the « wims-exams with real scores/grades ».
The intranet server is not reachable from the internet…we must operate in a clumsy Microsoft based network 
The school server is automatically synchronized at 7.00 every day ( Leiden mirror –> intranet ) for user accounts and passwords.
Worksheets and exams are also copied and are set to « invisible and inactive » on our school server.
In that way a teacher can activate the « exam for a real score » at the start of the lesson. No cheating is possible.
The automatical update is not a wims feature … we use a « cronscript » on the Leiden mirror for this.
A « cronscript » on the school server uses Wget to fetch the daily update and do the unpacking and some other admin stuff.
kind regards,
Joke