What is SPYDERX?

    SpyderX is a Psion 3a program which provides the ability to
    create, manipulate, report, and execute the contents of webs of
    hypertext, mathematical expressions, and program scripts.
    The webs may be used to store data, perform cellular and iterative
    calculations, execute general purpose programs, and support the
    creative process in complex problem domains. 

    Applications of SpyderX include: hypertext database,
    outline processor, formula calculator, job cost estimator,
    scheduling tool, financial modeling tool, dynamic system simulator,
    differential equation solver, semantic network modeler, and general
    purpose programming language.

    When you pay the $33 SpyderX registration fee, you receive a diskette
    containing the latest shareware version of the program, a printed
    user's manual, a key to disable registration reminders, and some
    sample webs illustrating typical applications of the program.