[SOLVED] What does DSN format file mean?

[gigahertz]

Maybe this is a real elementary question, but I see mention of DSN files a lot. Is this strictly an Orcad schematic item, or is there some other files called this format? If so, what does this mean?

Thank you.

 

[fisher101]

it is strictly schematics thing it is generated by proteous odbc and orcad

it is a file that is used for pcb routing and transfering it from capture to layout