purpose of msvcrt , msvcp dlls in windows distribution of firebird

Hi ,
In order to incoporate an fix in firebird (multi connection meta data iupdate). I am in the process of building firebird in my environment.
In default firebird windows distriibution there are two dlls , namely msvcrt.dll , msvcp60.dll under <firebird>/bin. Kindly tell me what is the purpose of this dlls,

I have locally built firebird with MS7.0. During that process firebird scripts (.iss ) tries to bundle msvcrt.dll and msvcp70.dll. Do I need to bundle those dlls along with firebird. What is the need for those dlls when builing firebird in MS7.0.

Kindly tell me so that I can package those dlls as per your suggestion,

S.Karthick