The default limit on the number of file descriptors that a process can open is 64. The limit can be increased through the limit command of csh(1), the ulimit command of sh(1) and ksh(1), and the setrlimit(2) system call. If the limit on the number of file descriptors is increased to more than 256 a process running under either static or dynamic BCP can fail. The failure can happen even though fewer than 256 files are open. Most 4.x applications can handle only 256 file descriptors.