The signal list

Although this exercise used only one signal of the input record, many applications will use two or more signals simultaneously. The Signal list initially contains the signal numbers of all available signals; as noted above, the signal list can be passed to an application listed in the menu file as a set of command-line arguments in place of the string `$SIGNALS'. Although you can type into the Signal list field directly to change it, you can also do so using the mouse. Pointing to a signal, hold down the key while clicking left to add it to the signal list, or hold down the key while clicking left to delete its first occurrence from the signal list. (Most keyboards do not have a key labelled Meta. On most Sun keyboards, the Meta keys look like this: ; they flank the space bar. On most other keyboards, the key is equivalent to Meta.)