osFree wiki

user

prokushev (prokushev@undisclosed.example.com) — 2026-05-07T15:27:24+00:00

This is part of Win16 API which allow to create versions of program from one source code to run under OS/2 and Win16. Under OS/2 program can be running under Win-OS/2 if program is Windows NE executable, and with help on Windows Libraries for OS/2, if it is

postquitmessage

prokushev (prokushev@undisclosed.example.com) — 2026-05-06T08:12:57+00:00

00

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T09:20:46+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=00H Version 1 and higher Brief TERMINATE PROGRAM Family API DosExit Input AH = 00h CS = PSP segment Return never returns Macro INCLUDE DOS.INC TERMINATE_PROGRAM

int27

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T07:54:06+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 27H Version 1 and higher Brief TERMINATE AND STAY RESIDENT Family API Input * DX = number of bytes to keep resident (max FFF0h) * CS = segment of PSP

int26

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T07:51:49+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 26H Version 1 and higher Brief ABSOLUTE DISK WRITE (except partitions > 32M) Family API Input * AL = drive number (00h = A:, 01h = B:, etc) * CX = number of sectors to write (not FFFFh)

int25

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T07:48:24+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 25H Version 1 and higher Brief Absolute disk read Family API Input * AL = drive number (00h = A:, 01h = B:, etc) * CX = number of sectors to read (not FFFFh)

int20 - [Notes]

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T07:46:29+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 20H Version 1 and higher Brief TERMINATE PROGRAM Family API DosExit Input CS = PSP segment Return Never return Macro INCLUDE DOS.INC TERMINATE Notes Function is obsolete. Use

initapp

prokushev (prokushev@undisclosed.example.com) — 2026-05-04T07:26:57+00:00

oldexitwindows

prokushev (prokushev@undisclosed.example.com) — 2026-04-30T06:06:16+00:00

winver

prokushev (prokushev@undisclosed.example.com) — 2026-04-24T05:32:25+00:00

osFree Janus Version Simple application which shows the standard About dialog from SHELL.DLL or built-in About dialog box. The appearance of the dialog depends on the underlying implementation. [Windows Version] Features and Compatibility * Priority to System Library (SHELL.DLL):

index

prokushev (prokushev@undisclosed.example.com) — 2026-04-17T06:50:37+00:00

osFree documentation This is osFree documentation page. It is heavy mix of autogenerated documentation and hand-written documentation. Please select a category from below. * General information and architecture * Boot process guides and references * Kernel information * Neutral personality * OS/2 personality * Family API * MVM personality * DOS personality * Win16 personality * osFree toolkit * Toolkit installation * Tools reference *

gdi

prokushev (prokushev@undisclosed.example.com) — 2026-03-30T06:40:50+00:00

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prokushev (prokushev@undisclosed.example.com) — 2024-11-27T11:36:54+00:00

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prokushev (prokushev@undisclosed.example.com) — 2024-01-24T05:09:18+00:00

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prokushev (prokushev@undisclosed.example.com) — 2024-01-03T09:49:06+00:00

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prokushev (prokushev@undisclosed.example.com) — 2023-12-30T10:36:40+00:00

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prokushev (prokushev@undisclosed.example.com) — 2023-12-29T12:58:06+00:00