Community Tip - You can change your system assigned username to something more personal in your community settings. X
Link (requires login):
http://support.ptc.com/cs/help/windchill_hc/wc110_hc/
Even if you're on an earlier release, you might find the "New and Changed for this Release" topics interesting:
PTC Windchill Workgroup Manager
A few notes about using the help center (for those unfamiliar):