[ 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 ]

Z-buffer: In a graphics card, this section of video memory keeps track of which onscreen elements can be viewed and which are hidden behind other objects.

Zmodem: This file transfer protocol should be your first choice for sending and receiving files using dial-up connections. Zmodem's speed and error checking recommend it, and it can resume a file transfer after a break in communications, so make sure this protocol is available in your communications software and any BBS you dial into. In case you couldn't tell, it's so named because it's intended to supersede Xmodem and Ymodem.