Returns the names of the specified open workbooks
[C++]
static int Documents(
   std::vector<CString>& documents,
   short int type_num = 1,
   const char* match_text = 0
);
A vector of strings which will be populated with the list of names.
Type_num is a number specifying whether to include add-in workbooks in the array of workbooks.
Match_text specifies the workbooks whose names you want returned and can include wildcard characters.
Zero if the function has been called successfully; non-zero
            if the function could not be called.
            See Error codes for a list
            of return values.
See the Microsoft Excel on-line Help for full details about
            this function.
Header: xlfuncs.h