http://www.ctyme.com/intr/rb-2980.htm DOS 2+ internal - SET CURRENT PROCESS ID (SET PSP ADDRESS) AH = 50h BX = segment of PSP for new process Notes: DOS uses the current PSP address to determine which processes own files and memory; it corresponds to process identifiers used by other OSs. Under DOS 2.x, this function cannot be invoked inside an INT 28h handler without setting the Critical Error flag. Under MS-DOS 3.0+ and DR DOS 3.41+, this function does not use any of the DOS-internal stacks and may thus be called at any time, even during another INT 21h call. Some Microsoft applications such as Quick C 2.51 use segments of 0000h and FFFFh and direct access to the SDA (see #01687 at AX=5D06h) to test whether they are running under MS-DOS rather than a compatible OS; although one should only call this function with valid PSP addresses, any program hooking it should be prepared to handle invalid addresses. This function is supported by the OS/2 compatibility box. This call was undocumented prior to the release of DOS 5.0 See Also: AH=26h - AH=51h - AH=62h Category: DOS Kernel - Int 21h - D ※ 引述《[email protected] (try or test)》之铭言： : > DOS 只是没有 UNIX 的多工，可以视为循序执行的单工环境， : > （把自己串到 Interrupt Vector 的 TSR 不讨论） : > 但是仍然有父子行程的概念 : > 另外，如果去读 PC DOS 7.0 使用手册， : DOS 7.0 跟 win95 已经是同一种版本了, 从 win3.1 之後开了多个视窗 : 同时跑(至少是交错地跑), 要算那一种系统 ? : DOS 过了 286 protection Mode 的时代进入 VM386, 只要是用了 MMU 功 : 能且使用1MB 以上高位址记忆体执行程式, 就进入 win32 . : 使用了 protection mode 执行程式(不是只拿 1MB 之後当 ram disk 用, : 再用 pseudo reset 切回 real mode 跑程式), 不想用多工都不行, 那个 : VM386 mode 是硬体多工. : > 系统呼叫 功能 : > 00H Terminating a program : > 31H Terminating a program with a specified portion remaining in memory : > 4CH Terminating a program and passing control to the calling process : > 4DH Determining how a process ended : > 这代表 DOS 是有 Process 概念的... --

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