Borland C++ DLLs is a small pack of libraries needed for programmers who often work in Borland C++. You need to register is you want the already compiled programs to work, as they are continually referenced.
The libraries offered by Borland C++ DLLs are the following: bds52f.dll, cw3230.dll and owl52f.dll. By having them it will be much easier to compile, as you won`t get the typical error messages saying you`re missing an essential library to be referenced.
Borland C++ DLLs is, of course, totally free.