This function sets the given system pointer to the new icon specified by the ICONINFO structure that is passed in. Provided that the icon is valid, the screen will be refreshed with the updated system pointer if necessary.

If NULL is passed for the pIconInfo parameter, the operating system reverts back to the default pointer shapes defined by the system. All alterations made using WinSetSysPointerData are persistent. They are preserved across IPLs of the system.