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...There he developed the [[time-sharing]] system used by [[APL*PLUS]], and [[Mailbox]], one of the first ever [[wikipedia:email|email]] systems. ...ment of the APL PLUS time-sharing system. While there, in 1972, he wrote [[Mailbox]], one of the world's first worldwide email systems.<ref>[[Roger Hui]]. [ht

She met [[Morten Kromberg]] via the IPSA Mailbox (also written in APL, before the Internet), which (as opposed to today's em

He met [[Gitte Christensen]] via the IPSA Mailbox (also written in APL, before the Internet) and moved to the IPSA Copenhagen

* '''Corporate Communications Using the SHARP APL Mailbox'''. [[Leslie Goldsmith|Leslie H. Goldsmith]].