So, what exactly is vmulti.sys ?
Developers testing touch-based Windows applications (UWP, WinUI, WPF) without expensive touch monitors use vmulti.sys . A script moves the mouse and sends mouse-down events as touch points via the driver. vmulti.sys
To appreciate vmulti.sys , you need to understand the HID stack in Windows. So, what exactly is vmulti
: Users frequently find that the driver remains active or continues to cause conflicts even after the associated hardware has been uninstalled. Enables advanced input emulation for tablets and joysticks. High correlation with system instability and BSODs. Essential for certain niche hardware (e.g., Huion tablets). Difficult to install/sign on modern 64-bit Windows. Open-source roots allow for community customization. vmulti.sys
Get-WindowsDriver -Online | Where-Object $_.Driver -like "*vmulti*"