IDAS is designed to operate in the Windows NT 4.0 and Windows 2000 environments. IDAS also operates in the Windows 95 and 98 environments, although there may be some irregularities. It is recommended that at a minimum, IDAS is run on a 300 megahertz Pentium II processor, due primarily to the use of complex algorithms in the assignment process and the graphical interface. In addition, it is recommended that at least 128 megabytes of RAM and at least two gigabytes of free disk space are available when running the IDAS programs. For larger networks (greater than 750 zones), at least five gigabytes of free disk space should be made available.