Send scroll event to User Input Emulation.
PRL_RESULT PrlVm_UIEmuSendScroll( PRL_HANDLE hObj, PRL_UIEMU_SCROLL_UNITS scrollUnits, PRL_INT32 scrollX, PRL_INT32 scrollY, PRL_UINT32 flags );
PrlApiVm.h
PRL_RESULT. Possible values: PRL_ERR_UNINITIALIZED - SDK was not properly initialized. PRL_ERR_INVALID_ARG - hVm is invalid, uiEmuVersion or text is 0. PRL_ERR_OUT_OF_MEMORY - memory allocation error during send. PRL_ERR_FAILURE - failed to send event.