CSAA can be enabled in one of the two following scenarios:
When the application specifically enables CSAA.
When CSAA is turned on in the control panel by the end user. The control panel offers users one of two options:
“Enhance” mode: All application-created MSAA surfaces are converted to CSAA surfaces using the control panel-specified CSAA mode.
“Override” mode: The control panel forces a CSAA-enabled backbuffer. Note that this mode only works for applications that render directly to the backbuffer.