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.
, C++ is my bread and butter language. This is a specific type of cast called a C-Style cast. What it does in this case is transform the return type of the function to an int. In addition to this, C++ has several variants. The most used is static_cast.