V ault ▁Rem ote ▁Back up ▁Service . ▁The ▁company ▁closed ▁in ▁April ▁ 1 9 9 9 ▁and ▁the ▁intellectual ▁property ▁became ▁part ▁of ▁E V ault , ▁which ▁was ▁sold ▁to ▁Se ag ate ▁Technology ▁in ▁ 2 0 0 7 . ▁ ▁In ▁ 1 9 9 2 ▁Ze id man ▁wrote ▁his ▁second ▁novel , ▁“ Hor ror ▁F lick .” ▁ ▁In ▁January ▁ 1 9 9 9 ▁Ze id man ▁founded ▁the ▁company ▁The ▁Ch alk board ▁Network , ▁which ▁ran ▁until ▁December , ▁ 2 0 0 2 . ▁The ▁company ▁featured ▁business ▁and ▁engineering ▁courses ▁from ▁world - leading ▁exper ts , ▁hosted ▁on ▁the ▁Internet ▁and ▁employ ing ▁Dep th ▁Control ® , ▁an ▁instruction al ▁design ▁method ology ▁for ▁Web - based ▁training ▁that ▁Ze id man ▁developed . ▁ ▁Also ▁in ▁ 1 9 9 9 ▁Ze id man ▁wrote ▁and ▁published ▁his ▁first ▁engineering ▁text ▁book , ▁“ Ver ilog ▁Design er ’ s ▁Library .” ▁ ▁In ▁ 2 0 0 0 ▁Ze id man ▁wrote ▁and ▁published ▁his ▁second ▁engineering ▁text ▁book , ▁“ Introduction ▁to ▁Ver ilog .” ▁ ▁In ▁December ▁ 2 0 0 2 ▁Ze id man ▁founded ▁the ▁company ▁Ze id man ▁Techn ologies , ▁which ▁provides ▁software ▁tools ▁for ▁embedded ▁software ▁development . ▁The ▁company ' s ▁pat ented ▁flags hip ▁product ▁is ▁Syn th OS ® ▁software ▁that ▁automatically ▁synth es izes ▁optimized ▁source ▁code ▁for ▁a ▁custom ▁real ▁time ▁operating ▁system .