Houston TranStar to Use PSIM Software to Highlight Information Sharing and Inter-Agency Collaboration During Emergencies for Improved Situation Management Vienna, Va. ─ April 30, 2010 ─ VidSys, the leading provider of Physical Security Information Management (PSIM) software that allows organizations to resolve business and security situations in real time, today announced that the City of Houston has chosen the VidSys PSIM