TECH Help! covers the following programming "toolboxes", often called Application Programming Interfaces or APIs: BIOS Functions all system interrupts DOS Functions DOS file system, memory, devices, etc. APM API power management services Append Services when DOS Append command is resident AT Keyboard Functions command codes for the keyboard controller Device Driver Requests installable device drivers Doskey Services when DOSKEY.COM is resident DoubleSpace API control drive IDs, unmount, CVF layout DPMI Services DOS Protected Mode Interface services EMM Services expanded Memory Manager services FaxBIOS discussed in overview only HMA Sub-Allocations allocate memory in the HMA when DOS=HIGH IOCTL Functions DOS fn 44H control of devices Keyb Services when KEYB.COM is resident Mouse Support when mouse support has been installed MRCI API Microsoft Real-Time Compression services Mscdex Services CD-ROM services Multiplex Interrupt INT 2fH portal to various APIs Print Spooler Services when PRINT.EXE is resident Task Switcher API DOS Shell services and notifications VESA/SVGA Services SuperVGA services with compliant BIOS Video Services all INT 10H services Windows 386Enh Services used when in a DOS session under Windows Windows Clipboard Access used when in a DOS session under Windows Windows VM-aware VDD fns screen save/restore under 386Enh mode XMS Services extended Memory services (HIMEM.SYS) ──────────────────────────────────────────────────────────────────────────── Service Groups TECH Topics