of a subsequent screen may be displayed one type of operating system which provides this type of operation is that sold under the name windows available from microsoft corporation redmond wash programming this operating system is described in the book programming windows by charles petzold microsoft press the invention is overlaid onto the operating system the invention intercepts mouse messages and in effect distributes selected mouse messages namely those causing scrolling to the other computers although all scrolling messages could be distributed to the other computers thereby causing all computers to behave identically a different approach is preferred fig9 is a flow chart illustrating the preferred procedure fig9 illustrates logic which is interconnected into the mouse processing routines of the operating system block 75 indicates that the invention intercepts mouse messages decision block 80 indicates that these messages are examined and inquiry is made whether the messages request scrolling if not the no branch is taken and the mouse processing routines continue in the normal manner as indicated by block 85 if the mouse messages do call for scrolling then the yes branch is taken from block 80 block 90 indicates that the invention waits for scrolling to terminate for example scrolling may be executed by.