subscription updates

[Patrick Thomas <thomas_p@ligo-wa.caltech.edu>]

 Hi,

The channel access reference manual states that:

There is unfortunately no field in the protocol allowing the server to 
indicate that an intervening subscription update was discarded.

Is there a way to ensure that an intervening subscription update will 
not be discarded? Would you have to ensure that each callback executes 
in a certain amount of time, ie, faster that the channel update interval?

Thank you,
Patrick