HP 39gII User Manual page 276

ISKEYDOWN
MSGBOX
266
Syntax: ISKEYDOWN(key_id);
Returns true (non-zero) if the key whose key_id is
provided is currently pressed, and false (0) if it is not.
Syntax: MSGBOX(expression or string [ ,ok_cancel?]);
Displays a message box with the value of the given
expression or string.
If ok_cancel? is true, displays
keys, otherwise only displays the
value for ok_cancel is false.
Returns true (non-zero) if the user presses
if the user presses
and
key. Default
.
menu
, false (0)
Programming