INT 2F - MS Windows - IOS - GET API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. ENTRY POINT AX = 1684h BX = 0010h (virtual device ID for IOS device) (see #02642) ES:DI = 0000h:0000h Return: ES:DI -> VxDA virtual device driver for Windows 3.x or 95. So called because nearly all of the Windows 3.0 drivers had names of the form "VdeviceD". See also device driver. API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. entry point (see #02654) 0000h:0000h if the VxDA virtual device driver for Windows 3.x or 95. So called because nearly all of the Windows 3.0 drivers had names of the form "VdeviceD". See also device driver. does not support API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. in current mode SeeAlso: AX=1684h"DEVICE API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes.",INT 20"Windows" (Table 02654) Call IOS entry point with: EAX = function number 0000h ??? Return: CF clear if successful AX = 0000h CF set on error AX = FFFFh 0001h check if ??? Return: CF clear if successful AX = 0000h CF set on error AX = FFFFh 0002h requestor services??? DL = service number??? Return: CF clear if successful AX = 0000h DX = ??? CF set on error AX = FFFFh Note: calls "IOS_Requestor_Service" (see INT 20"Windows") 0003h ??? (copies five bytes of data internally) Return: CF clear if successful AX = 0000h EDX = ??? CF set on error AX = FFFFh else Return: CF set AX = FFFFh SeeAlso: #02653,#02655