DbgPrompt - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTDBG_H

NTSYSAPI
ULONG
NTAPI
DbgPrompt(
    _In_ PCCH Prompt,
    _Out_writes_bytes_(Length) PCH Response,
    _In_ ULONG Length
    );

#endif

View code on GitHub

This function is documented in Windows Driver Kit.