The information system HOTGAS 2.0 for calculation of rovibrational spectral line parameters (SLP) (centers, intensities, half-widths, energies of low states) of CO, CO2 and H2O in 0 - 10000 cm(-1) spectral range and in 200 - 3000 K temperature range is described The information system HOTGAS 2.0 developed for Windows 95, 98, NT has a friendly user interface with textual and graphical information performance, which allows for using graphics and tables in other Windows applications, such as Word, Excel, etc. The HOTGAS 2.0 makes calculations of the absorption coefficient for single or mixed gases available.