GO-Global generally works in this situation, but there are issues relating to the suspend/resume functionality. Specifically, if someone logs in using the same username as someone else, they may be able to resume that user's suspended sessions. For this reason, most people that need to allow logins by multiple people using the same username will disable suspend/resume functionality by changing ${GOGLOBAL_ROOT}/etc/gold.conf:

no_explicit_suspend = true
suspend_age = 0

Also, note that in later versions of the product, there is a per-user XML database that will be shared, so if users publish applications to themselves, they will appear for ALL users sharing that username. This may or may not be desirable.

Hope this helps,
Troy