proper use of segno with multiple instruments

[Mason Hock]

I think that D.C, D.S, and segno marks conventionally do not appear on each 
stave, but usually either above each staff group or the entire system. If this 
is not the case, what is the convention? If it is the case, then I have some 
questions about how to achieve this.

While I don't have a complete grasp on contexts, I think that my question might 
be generalized to "How to I make something belong to the Score context?" It 
seems that things that belong to the Score context, such as Volta_engraver, 
appear only above the system, even if they are included in the music for every 
staff. This snippet[1] seems to demonstrate how to make such information appear 
above a particular staff, but I'm having trouble finding a way to do the 
opposite. Also, since Volta_engraver is an engraver while \segno and ^\markup { 
D.S. al fine } are staff objects it is possible that I'm on the wrong track 
completely.

Guidance would be much appreciated.

Thanks,

Mason

[1] 
http://lilypond.org/doc/v2.19/Documentation/snippets/repeats#repeats-volta-multi-staff

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