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.
The next entry is the expression cstr+3, which is just a pointer to the 4th element in the array. And not surprisingly, the expansion shows a 'c'. The last entry is cstr+3,3, which says to treat the pointer to the 4th element in the array as an array of 3 chars; and so we see in the expansion 'c', 'e', and 'n'. Figure 2 Watch Pointers Treated as Arrays.