diff --git a/porthole/src/windows/driver.h b/porthole/src/windows/driver.h
index 0b230e18..a0886efa 100644
--- a/porthole/src/windows/driver.h
+++ b/porthole/src/windows/driver.h
@@ -15,5 +15,13 @@ PortholeMsg, *PPortholeMsg;
 
 typedef int PortholeMapID, *PPortholeMapID;
 
-#define IOCTL_PORTHOLE_SEND_MSG      CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
-#define IOCTL_PORTHOLE_UNLOCK_BUFFER CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
\ No newline at end of file
+typedef struct _PortholeEvents
+{
+  HANDLE connect;
+  HANDLE disconnect;
+}
+PortholeEvents, *PPortholeEvents;
+
+#define IOCTL_PORTHOLE_SEND_MSG        CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#define IOCTL_PORTHOLE_UNLOCK_BUFFER   CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#define IOCTL_PORTHOLE_REGISTER_EVENTS CTL_CODE(FILE_DEVICE_UNKNOWN, 0x802, METHOD_BUFFERED, FILE_ANY_ACCESS)
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