( -- char
Receive one character char
, a member of the
implementation-defined character set. Keyboard events that do
not correspond to such characters are discarded until a valid
character is received, and those events are subsequently
All standard characters can be received. Characters received by
are not displayed.
Any standard character returned by KEY
has the numeric
value specified in 22.214.171.124 Graphic characters
Programs that require the ability to receive control characters
have an environmental dependency.