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kbhit
=====

Syntax
------

     #include <pc.h>
     
     int kbhit(void);

Description
-----------

If the user has hit a key, this function will detect it.  This function
is very fast when there is no key waiting, so it may be used inside
loops as needed.

If you test shift/alt/ctrl status with bios calls (e.g., using `bioskey
(2)' or `bioskey (0x12)') then you should also use bios calls for
testing for keys.  This can be done with by `bioskey (1)' or `bioskey
(0x11)'.  Failing to do so can cause trouble in multitasking
environments like DESQview/X.

Return Value
------------

Nonzero if a key has been hit, else zero.

Example
-------

     while (!kbhit())
       do_stuff();