| DCICMD | This structure is the DCI Command header that is included as part of the two input structures for the various DCI calls: DCICREATEINPUT and DCIENUMINPUT. |
| DCICREATEINPUT | The structure is used by a DCI Client to provide input parameters for all the DCICreate calls. The relevant fields differ for each of the three calls. Details are in the chapter providing the function specifications. |
| DCIENUMINPUT | The structure is used by a DCI Client to provide input parameters for the DCIEnumSurface call. |
| RGNDATA | Structure defined in the Win32® API that describes visible area of a region. This structure is used to pass a Cliplist to a DCI offscreen surface Provider. |
| DCISURFACEINFO | This structure is used to return information about available support, during a DCIEnumSurface call. This structure is also used as a member of larger structures returned by the various DCICreate calls. |
| DCIPRIMARY | This structure must be allocated and returned by the DCI Provider in response to a DCICreatePrimarySurface call. |
| DCIOFFSCREEN | This structure must be allocated and returned by the DCI Provider in response to a DCICreateOffScreenSurface call. |
| DCIOVERLAY | This structure must be allocated and returned by the DCI Provider in response to a DCICreateOverlaySurface call. |