DevHlp services include
Service Code Description
DevHlp_CloseFile 80h Close file (system
initialization time only)
DevHlp_FreeCtxHook 64h Free context hook
DevHlp_FileOpen 7Fh Open file (at initialization)
DevHlp_GetDosVar 24h Return address of kernel
variable
DevHlp_KillProc 7Dh Kill process unconditionally
DevHlp_OpenFile 7Fh Open file (system initialization
time only)
DevHlp_PerfSysTrace 45h Write Software Trace information
to STRACE buffer
DevHlp_QSysState 7Eh Get system status information
DevHlp_ReadFile 81h Read (system initialization time
only)
DevHlp_ReadFileAt 82h Seek and read (system
initialization time only)
DevHlp_RegisterKDD 83h Register driver with kernel
debugger
DevHlp_SysTrace 28h Add information to System Trace
buffer
System event notification
Event Index Description event_POWER 9 Power off event