X0202 4 2006-01-19 0 0000754813 ION NETWORKS INC IONN 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2006-01-19 4 P 0 48000 0.1731 A 10018461 I By Limited Partnerships Common Stock 2006-01-20 4 P 0 5700 0.1741 A 10024161 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, LP (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology Fund II, L.P. (Tech II), respectively. 3,442,650 shares of Common Stock and 1,593,940 Wts are held by QP, 1,323,147 shares of Common Stock and 604,324 Wts are held by Cayman, 1,416,253 shares of Common Stock and 666,476 Wts are held by PE, 103,121 shares of Common Stock and 50,780 Wts are held by Tech and 552,826 shares of Common Stock and 270,644 Wts are held by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, PE, Tech and Tech II is limited to the extent of his pecuniary interest. Austin W. Marxe 2006-01-24 David M. Greenhouse 2006-01-24