Multibox

Multiboxing is having the ability to play multiple characters at the same time, either on the same (often called dual-logging, or multi-logging) or different computers.

You can log into different accounts at the same time. Simply launch the DDO game client twice (or more depending on the specs of the computer). The DDO game launcher has an options menu that provides this built-in functionality. Under the General Settings tab, make sure the "Allow multiple game instances" option is checked.

Logging into the same account again will simply close your first client with an error stating "User logged into (SERVER NAME) server."

Builds
There have been some builds designed to be generic all around utilitarian builds for multiboxing purposes.