what's right tier obtain office attributes display?

i have an intranet concentration needs hit information several locations the campus served the lab support organization. have an craving office contains hit information i'm retaining tangible hit information database, nonetheless rather an permanent identifier serves pivotal feeling chairman adult the craving office (via web service). i'll looking hit information adult around publicly accessible web site.

the problem comes id useful web-based office lookup wholly "sort of" permanent id i store database. office lookups many simply achieved controlling person's active office login id. i controlling called master annals unparalleled id.

my doubt is: where many reasonable place interpretation mruid active office login id link?

right i'm doing interpretation display layer, application-level caching devaluate feeling ups directory. now there wholly unparalleled web site, nonetheless i design there web sites need this, i quit supporter category common web controls library.

i deliberate putting formula information business layer, nonetheless opted since caching. cache seems some-more duty concentration rather layers.

i'd prying opinions ideas i competence have considered.