Note: This API calls are shared between DOS and Win16 personality.
DOSSHELL is a stripped down version of 16-bit Windows. Some APIs shared and same. DOSSHELL uses older version of API, but Win16 has more advanced APIs.
GRB is a plain binary file with 0 offset
Note: This API used by video device driver files with GRB extension. Used by DOSSWAP.EXE under DOS and by WINOLDAP.MOD under Windows to grab and restore screen