The method of api hook by modifying call instructions in code sections of modules in address space of application

The present invention relates to the application control method for use in modifying the random function without modifying the source code of the computer application, or add new features, unlike the application control methods previously used, run code area of ​​an application (Code Section), because the way to fix it is possible to control the system API calls in the closest position from application has a feature where the application is to gain control in the process of calling the system API to first. Because of these characteristics, the effect of fundamentally blockade with room for application to program and other traditional application control method in the interference between the controllers. In particular, the application to the security of the input digital data when used to add a real-time digital data decryption function, caused by chronic when ensuring the secure exchange of data between the application and the controller using the existing control system data Width this has the effect becomes essentially impossible to original digital data leakage by interception system. It is also very useful for adding features to be put so the operation of the application by one trillion kinds it is possible to neutralize the existing control application method, the application of fire control. Application control, executing the code domain, Code Section, CALL