Key() action

Description
The Key emulates pressing a key on the 3270 keyboard.

Parameters
Key takes a single parameter, the key to input. The key can take several forms:
 * A single character.
 * An X11 keysym name.
 * An APL keysym name.
 * A Unicode character value, e.g., U+0061 for a. Unicode characters can also be entered in hexadecimal notation, e.g., 0x0061.

Examples
Key(a)