>I use wires that end on the right with a label to indicate
>that this signal is being driven on this page, but also goes
>elsewhere.  On other pages you will see these lines coming
>in from the left, meaning the signal is being received from
>elsewhere.  This is my convention, not universal accross other
>people's schematics.  It all follows from generally wanting
>signals or information flowing left to right.

Some schematic capture packages also require things done in a similar way to 
make connections between sheets. It may not be obvious when looking at a 
printed schematic, but there are methods of doing hierarchical diagrams that 
require specific connection methods to make the thing work as a whole. It is 
a bit like modular programming or OOP for schematics. 

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