The Anchor Mouse option is set if the mouse cursor is to return to its original position after the pointer device has been used. Normally used in multi-monitor configurations where the cursor is to return to another monitor. This feature is configured via the Anchor Mouse global settings that effects all UPDD configured pointer devices.

In later versions of the driver these settings are also available in the UPDD Console, General settings

UPDD uses two different interfaces in Windows to post touch data, mouse and HID. This feature works as expected when using UPDD Mouse interface.
When using the UPDD HID touch interface the cursor is not seen at the point it is returned to its original position. Further it has been reported that in some cases the cursor is not returned but we have not been able to reproduce this issue.