A | B | C | D | E | F | G | H | I | J |
K | L | M | N | O | P | Q | R | S | T |
U | V | W | X | Y | Z | 0...9 |
XA |
XAPIA |
XBASE |
X_CONSORTIUM |
XENIX |
XGA |
XMP |
XMS |
XNS |
X/OPEN |
XPG |
XSI |
X_TERMINAL |
XTI |
XTP |
X-WINDOWS |
X_WINDOW_SYSTEM |
X.21 |
X.25 |
X.200 |
X.400 |
X.500 |
X.700 |
X.800 |