Location:
mtmuidef.hrh
EMtmUiFlagEditorPreferEmbedded
Supported from 6.0
MTM prefers that any message viewers or editors that are launched, for example when a message is created, are embedded in the calling application.
EMtmUiFlagEditorNoWaitForExit
Supported from 6.0
Application doesn't need to wait for message editor to exit.