External environment refers to the major factors and forces outside the organization that have the potential to significantly affect the performance of an organization. External environment is divided into two parts i.e. mega environment or general environment and specific or task environment.
_tcscat is a C function, to concatenate C-style strings; CString is a class (which has built in concatenation via operator+), not a C-style string.
A C++ string is an object of the class string, which is defined in the header file <string> and which is in the standard namespace. The string class has several constructors that may be called (explicitly or implicitly) to create a string object.