Well, Megan. As I know, simultaneous entries are not possible. I have been using EpiData in clinical research and constantly dealing with multiple users input. Right now I am creating a set of files to be used for a multicenter study about Neonatal Care Units (up to 50). What I do is to distribute sets of REC/CHK files (named specifically after each center) and recover the filled REC files through the use of a Web based free, but access-limited Group (like Yahoo Groups), what turns to be a additional backup system for my precious files. Having different files make it possible to first check the adequacy of each file before combining them. Combine files is quite fast and easy. Hope it helps. MARCO MOURA

================================== Dr. MARCO Antonio MOURA Reis, MD, PhD Discipline of Medical Informatics Department of Medicine University of Region of Joinville - UNIVILLE Joinville (SC) - BRAZIL

E-mail: mmoura@infomedica.com.br ==================================