Exhibit 23.3 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS We consent to the inclusion in this registration statement on Form SB-2 (File No. 333-109522) of our report dated September 23, 2002 on our audit of the consolidated financial statements of Invisinet, Inc. We also consent to the reference to our Firm under the caption "Experts." /s/Blackman Kallick Bartelstein LLP Chicago, Illinois March 31, 2004