This function is documented in Windows SDK.
NtQuerySystemInformation is used to check some system information available only in KernelMode (above 0x80000000).
All available (or all known) information classes are described in SYSTEM_INFORMATION_CLASS.
Information class (see SYSTEM_INFORMATION_CLASS).
User-allocated buffer for results. Sometimes this parameter can be NULL (OPTIONAL), if you check required buffer size (see below).
Length of SystemInformation buffer (in bytes).
Required length of SystemInformation buffer.
- Sven B. Schreiber
- Tomasz Nowak
NtSetSystemInformationSYSTEM_INFORMATION_CLASS