different processes using same file object

[krushnaal pai <krisonearth@xxxxxxxxx>]

i have 2 completely different processes A and B (they do not have any relationship)

suppose A opens a file with file descriptor 4 and
B opens another file with file descriptor 5

can process A use the fd 5 (i.e using the file object of processs B) by any means..

if suppose i let the fd 4 of process A to point to the file object of process B(fd 5)

will it work?

is it safe?