Oracle Enterprise Manager
The initial logon to the management server is SYSMAN/oem_temp.
If you change the SYSMAN password and forget it a script exists $ORACLE_HOME/sysman/admin/vduresetsysman that you execute from SQL*Plus, logged on as your oem schema owner. This resets SYSMAN to password oem_temp.
If this does not work, export oem repository owner, delete it (with the oem configuration manager) and create a new one (with the oem configuration manager).
I found it hard to get Enterprise Manager working with the console, management server and the repository all on the same windows box. When I changed the SYSMAN password and restarted the box it reverted to oem_temp. This resolved itself when I installed the repository and the management server on a seperate Linux box.
To configure the management server (and to stop it!) you need an xterm for a UNIX/Linux box.
The username/password required to start/stop the management server is SYSMAN/?.