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function navail = KbEventAvail(deviceIndex)
% navail = KbEventAvail([deviceIndex])
%
% Return current number of recorded events in the event buffer of a
% keyboard queue in the return argument 'navail'.
%
% By default, the event buffer of the default keyboard queue is checked,
% but you can specify 'deviceIndex' to check the buffer of the queue
% associated with 'deviceIndex'.
%
% Keyboard event buffers are a different way to access the information
% collected by keyboard queues. Before you can use an event buffer you
% always must create its "parent keyboard queue" via KbQueueCreate() and
% call KbQueueStart() to enable key event recording. See "help
% KbQueueCreate" etc. on how to do this.
%
% _________________________________________________________________________
%
% See also: KbQueueCreate, KbQueueStart, KbQueueStop, KbQueueCheck,
% KbQueueWait, KbQueueFlush, KbQueueRelease
% 21.5.2012 mk Wrote it.
if nargin < 1
deviceIndex = [];
end
navail = PsychHID('KbQueueFlush', deviceIndex, 0);
return;
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