How to enhance Virtools functions : 2 types of development methods available. -VSL(Virtools Script Lunguage), able to create and put C++ descripting in Virtool Developer Tools.. -SDK(Software Development Kit): able to create DLLs using Microsoft VisualC++6.0. VSL script manager (direct C++ description) Development by SDK (VisualC++6.0 use) Usages of VSL Able to improve response by modifying a finished script as C++ using SDK's source code. VSL shall be used when to descrive an artithmetic calculus in the script. This makes it easier than to create a logic using Behaivior The created new function is embedded  into  an output file. Therefore,  it is no necessary to prepare/distribute DLLs, etc., additionally. Usages of SDK The SDK creates  DLLs, and calls such DLLs from application. therefore, advantageous in response speed. Able to call/use DLLs developed with other tools than Virtools,  Possible to embed the function of  other tool to the application.. Images of Developments using SDK /VisualC++ Behavior plug-in making Structural design Plug design Context design Refer to SDK Manuals New making project Virtools plug-in DLL making Manager plug-in making Event design Context design Windows, WindowsNT, Internet Explorer, DirectX, and VisualC++ are trademarks of United States Microsoft Corporation in the United States and other countries  Other company names, product names and other trade names indicated in this page may be trademarks or registered trademarks of their respective owners.