# SysInfo user defined functions Reference

Below is a complete list of the user defined functions available in AutoIt. Click on a user defined function name for a detailed description.

When using them you need to add a #include <WinAPISys.au3>.

User Defined Function | Description
--- | ---
_WinAPI_EnumPageFiles | Retrieves information for each installed pagefile in the system
_WinAPI_ExpandEnvironmentStrings | Expands environment variable strings and replaces them with their defined values
_WinAPI_GetCurrentHwProfile | Retrieves information about the current hardware profile for the local computer
_WinAPI_GetHandleInformation | Retrieves certain properties of an object handle
_WinAPI_GetPerformanceInfo | Retrieves the performance information
_WinAPI_GetPhysicallyInstalledSystemMemory | Retrieves the amount of RAM that is physically installed on the computer
_WinAPI_GetProcessShutdownParameters | Retrieves the shutdown parameters for the currently calling process
_WinAPI_GetStartupInfo | Retrieves the contents of the STARTUPINFO structure that was specified when the calling process was created
_WinAPI_GetSystemDEPPolicy | Gets the data execution prevention (DEP) policy setting for the system
_WinAPI_GetSystemInfo | Retrieves information about the current system
_WinAPI_GetSystemMetrics | Retrieves the specified system metric or system configuration setting
_WinAPI_GetSystemTimes | Retrieves system timing information
_WinAPI_GetSystemWow64Directory | Retrieves the path of the system directory used by WOW64
_WinAPI_GetTickCount | Retrieves the number of milliseconds that have elapsed since the system was started
_WinAPI_GetTickCount64 | Retrieves the number of milliseconds that have elapsed since the system was started
_WinAPI_GetVersion | Retrieves version of the current operating system
_WinAPI_GetVersionEx | Retrieves information about the current operating system
_WinAPI_GetWorkArea | Retrieves the size of the working area on the primary display monitor
_WinAPI_IsProcessorFeaturePresent | Determines whether the specified processor feature is supported by the current computer
_WinAPI_QueryDiskUsage | Retrieves the current percentage of the Disk IO Usage
_WinAPI_QueryPerformanceCounter | Retrieves the current value of the high-resolution performance counter
_WinAPI_QueryPerformanceFrequency | Retrieves the frequency of the high-resolution performance counter
_WinAPI_QueryProcessCycleTime | Retrieves the sum of the cycle time of all threads of the specified process
_WinAPI_QueryProcessorUsage | Retrieves the current percentage of the Processor Usage
_WinAPI_SetProcessShutdownParameters | Sets a shutdown order for a process relative to the other processes in the system
_WinAPI_SystemParametersInfo | Retrieves or sets the value of one of the system-wide parameters
_WinAPI_WaitSystemIdle | Wait both Processor and Disk IO are idle