• The above API functions can be called from the MAIN and ERROR sections.
• When you pass parameters to API functions, make sure that the data types of the parameters conform to the API specifications.
• You can specify an expression in a function call. If the data types of expressions and function calls conform to the API specifications, you can nest the function calls.
• If a runtime error occurs during execution of an API, the control moves to the ERROR section.
• If a function fails, you can use AIT_GetLastError to acquire the return code of the function. You can also use AIT_GetErrorText to acquire the text of the error message.

integer intvar1;
string Caption;
string Stringvar1, Stringvar2;
...
...
AIT_LogMessage("SAMPLE FUNCTION CALL");  // Function call
if(AIT_FocusWindow("Installable-Setup","#32770"))
        // Return value of the function is used in the expression.
   AIT_LogMessage("INSIDE Installable Software SETUP");  
        // Executed
   AIT_PlayKey("{Enter}");
endif;
        // Check for the abnormal end of the called function
Caption = "Installable Software";
intvar1    = AIT_GetSubStr(Stringvar1, Stringvar2, 50);
                                        // intvar1 is 0.
if(!intvar1)
           AIT_LogMessage(AIT_GetErrorText(AIT_GetLastError()));
endif;