Hello, I went to see Amitava today to ask him about file pointers vs file descriptors, I understand what a file descriptor is but I was told by Amitava that a file pointer is just a pointer that points at the file descriptor. But other sources on google and the reading provided says something like "When we do any kind of I/O in C, we do so through a piece of data that you get in the form of a FILE* type. This FILE* holds all the information needed to communicate with the I/O subsystem about which file you have open, where you are in the file, and so on." (from https://beej.us/guide/bgc/html/split/file-inputoutput.html#file-inputoutput one of the readings) which seems to indicate that it is more than just a pointer to the file descriptor and stores other information. Im not sure if I misunderstood him or my quesiton wasnt clear enough. If it is the case that its just a pointer to the descriptor why is fopen vs open used in some cases. The question below is the reason i ask, although I did not show Amitava the quesiton when asking him. "With respect to support for file input and output, provided by both the C11 standard library and an operating system, explain the relationship between file pointers and file descriptors. Explain why, or why not, it is possible to mix the use of file pointers and file descriptors within the same C11 program." Another thing is that with the principle of referential locality, is it just the idea that files typically execute sequentially? Because in the final workshop he mentions that its 2 things but doesn't really mention another thing.