The REX firmware was written by Starfish Software, and the hardware was manufactured by Citizen Electronics.

When Philippe Kahn left Borland in 1994 to found Starfish Software, he acquired all rights to Sidekick from Borland.

Kahn has founded four technology companies: Fullpower Technologies, Starfish Software, LightSurf Technologies and Borland.

Starfish Software (1994-1998)

Philippe Kahn was instrumental in the founding vision for synchronization with Starfish Software, later acquired by Motorola.

Sonia Lee also co-founded LightSurf and Starfish Software.

Motorola bought his first company, Starfish Software, for $258 million in 1998; about half of that amount went to Mr. Kahn himself.

Philippe Kahn, the flamboyant founder of Borland International Inc., said he was resigning as chairman today to concentrate on his latest start-up company, Starfish Software.

Philippe Kahn, Borland's founder and former chairman and chief executive, left in 1995 to start Starfish Software.

They have financed the company from the sale of their last venture, Starfish Software, to Motorola three years ago for $254 million.