function mcaunlock;
%MCAUNLOCK    - unlocks the MCAMAIN mex-file 
% .. so that it can be cleared from memory with CLEAR
%
% MCAMAIN starts in a locked state 
% to protect from it from being 
% accidentally cleared and
% loosing channel access connections.
%mca(0);
mocha('mexUnlock');
%disp('mca mex-file is now UNLOCKED');