What is the meaning of bcc32?

  borland-c, c++

I have installed bcc55 c++ compiler for windows 64bit OS. With this we can compile and execute C and C++ programs. My system is 64 bit OS. To compile the program in bcc55 compiler we have to use the following command bcc32 fileName.c
To run the C program we have to use fileName

In this, what is the meaning if bcc32?
Why they have named it like this.
Why the command is not like bcc64 fileName.c / bcc55 fileName.c

Source: Windows Questions C++