The VDD_Check_Update_Soon service forces the VDD to check to see if a page of video memory has been changed.
Parameters
EBX: Contains the VM handle of the VM to check updates for.
Return Value
Nothing returned, Nothing used.
Comments
When running a windowed VM, the VDD is responsible for detecting when an application has updated the screen. Every few timer ticks, the VDD checks to see if a page of video memory has been changed. However, a VxD such as the Virtual Keyboard Device (VKD) may want the VDD to immediately and synchronously check for screen updates when the VKD detects a keyboard event. This service provides a way to force the VDD to make this check immediately.