diff --git a/ViGEmClient.h b/ViGEmClient.h
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+++ b/ViGEmClient.h
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+/*
+MIT License
+
+Copyright (c) 2017 Benjamin "Nefarius" Höglinger
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+
+#ifndef ViGEmClient_h__
+#define ViGEmClient_h__
+
+#include "ViGEmBusShared.h"
+
+
+typedef enum _VIGEM_ERRORS
+{
+    VIGEM_ERROR_NONE = 0x20000000,
+    VIGEM_ERROR_BUS_NOT_FOUND = 0xE0000001,
+    VIGEM_ERROR_NO_FREE_SLOT = 0xE0000002,
+    VIGEM_ERROR_INVALID_TARGET = 0xE0000003,
+    VIGEM_ERROR_REMOVAL_FAILED = 0xE0000004,
+    VIGEM_ERROR_ALREADY_CONNECTED = 0xE0000005,
+    VIGEM_ERROR_TARGET_UNINITIALIZED = 0xE0000006,
+    VIGEM_ERROR_TARGET_NOT_PLUGGED_IN = 0xE0000007,
+    VIGEM_ERROR_BUS_VERSION_MISMATCH = 0xE0000008,
+    VIGEM_ERROR_BUS_ACCESS_FAILED = 0xE0000009,
+    VIGEM_ERROR_CALLBACK_ALREADY_REGISTERED = 0xE0000010,
+    VIGEM_ERROR_CALLBACK_NOT_FOUND = 0xE0000011,
+    VIGEM_ERROR_BUS_ALREADY_CONNECTED = 0xE0000012
+} VIGEM_ERROR;
+
+#define VIGEM_SUCCESS(_val_) (_val_ == VIGEM_ERROR_NONE)
+
+//
+// Represents a virtual gamepad object.
+// 
+typedef struct _VIGEM_TARGET *PVIGEM_TARGET;
+
+typedef VOID(CALLBACK* PVIGEM_XUSB_NOTIFICATION)(
+    PVIGEM_TARGET Target,
+    UCHAR LargeMotor,
+    UCHAR SmallMotor,
+    UCHAR LedNumber);
+
+typedef VOID(CALLBACK* PVIGEM_DS4_NOTIFICATION)(
+    PVIGEM_TARGET Target,
+    UCHAR LargeMotor,
+    UCHAR SmallMotor,
+    DS4_LIGHTBAR_COLOR LightbarColor);
+
+typedef struct _VIGEM_CLIENT_T* PVIGEM_CLIENT;
+
+PVIGEM_CLIENT vigem_alloc(void);
+
+void vigem_free(PVIGEM_CLIENT vigem);
+
+VIGEM_ERROR vigem_connect(PVIGEM_CLIENT vigem);
+
+void vigem_disconnect(PVIGEM_CLIENT vigem);
+
+PVIGEM_TARGET vigem_target_x360_alloc(void);
+
+PVIGEM_TARGET vigem_target_ds4_alloc(void);
+
+void vigem_target_free(PVIGEM_TARGET target);
+
+VIGEM_ERROR vigem_target_add(PVIGEM_CLIENT vigem, PVIGEM_TARGET target);
+
+VIGEM_ERROR vigem_target_remove(PVIGEM_CLIENT vigem, PVIGEM_TARGET target);
+
+#endif // ViGEmClient_h__