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are the white drawcords present in those grooves? - yes they are, just re-read your post; so they're designed to be accessed / cleaned - grease a good idea
there's a hole in the middle of the grooves - for screwed access cover?
are the frame openings designed as cable stops or do the entire inner and outer run the full length?
yes, drawcords for initial 'pull'; once you have cables in there they can be used for subsequent pulls