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In most cases these unsolicited contributions seem to be triggered by titles the user is shown , either in the catalog search or during the shelf browsing . Another demand placed on the user is caused by dealing with potential data synchronization conflicts . In contrast to other collaborative systems where the remote user is shown in a separate video window , eye contact is not lost with the ClearBoard , and a user can even recognize what the other user is looking at on the screen during a conversation . The Fully layered implementation is described for completeness ; however , the user is cautioned that the reduced probability of FPDU alignment when transmitting with this implementation will tend to introduce a higher overhead at optimized receivers . Submission of agenda items and attendance at meetings by users is encouraged . In the body of a function M-file , nargin and nargout indicate how many input or output arguments , respectively , a user has supplied . The user is cautioned to carefully consider sky levels as the backgrounds obtained in HST observations can cover significant ranges .