This function is specific to OS/2 Version 2.1 or higher.

This function is used in conjunction with the MsgInputHook hook to input simulated events into the Presentation Manager input processing system.

#define INCL_WININPUT /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB     hab;  /*  The application anchor block. */
BOOL    rc;   /*  Return code. */

rc = WinCheckInput(hab);