/** @addtogroup GRAS_virtu
* @brief System call abstraction layer (Virtualization).
+ *
+ * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref GRAS_API]
+ * <tr><td><b>Prev</b> <td> [\ref GRAS_timer]
+ * <tr><td><b>Next</b> <td> [\ref GRAS_globals] </table></center>
+ *
* @{
*/