 Other C0 codes besides ESC — commonly BEL, BS, CR, LF, FF, TAB, VT, SO, and SI — produce similar or identical effects to some control sequences when output.Pressing special keys on the keyboard, as well as outputting many xterm CSI, DCS, or OSC sequences, often produces a CSI, DCS, or OSC sequence, sent from the terminal to the computer as though the user typed it.For CSI, or "Control Sequence Introducer" commands, the is followed by any number (including none) of "parameter bytes" in the range 0x30–0x3F (ASCII codice_2), then by any number of "intermediate bytes" in the range 0x20–0x2F (ASCII space and ), then finally by a single "final byte" in the range 0x40–0x7E (ASCII codice_3.