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. Entry table is stable and not changed. Application must check address 015h for short jump opcode. If opcode is valid then assume interface is here.

Offset	Description	Version
0	InquireGrab	1.01
3	EnableGrab	?
6	DisableGrab	?
9	PromptGrab	?
12	InquireSave	?
15	SaveScreen	?
18	RestoreScreen	?
21	InitScreen	?

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