You can enable Security Audit in Shared Services and then navigate to Administration->Audit Reports->Security Report . This shows you all users that have logged in and to which product (also shows failed logins). Doesnt show IP though.
You say version 11.1.2 but that isnt too much info as there are some big differences between 126.96.36.199 and say 188.8.131.52.500. So you may not be able to carryout the above if you are on the earlier versions.