Returns the number of unread input events in the console's input
buffer, or <A HREF="../../../lib/Pod/perlfunc.html#item_undef"><CODE>undef</CODE></A> on errors. See also: <A HREF="#item_Input"><CODE>Input</CODE></A>, <CODE>InputChar</CODE>,
Reads and returns <EM>number</EM> characters from the console input buffer,
or <A HREF="../../../lib/Pod/perlfunc.html#item_undef"><CODE>undef</CODE></A> on errors. See also: <A HREF="#item_Input"><CODE>Input</CODE></A>, <CODE>Mode</CODE>.