The requirements are not really dramatic - common office PC is enough. The screen resolution should be at least 1024x768 to avoid scrollbars appearance in the calendar cells.

It is rather helpful to have .xml file type extension having associated with your Web browser with XSLT transformation capability - any modern browser like Mozilla Firefox or MS Internet Explorer will do.

If you like to fine-tune holy service plan within of spreadsheet application (like our priest), it is practical to register .csv file type to be opened by your spreadsheet.

For users of Microsoft operating systems is every needed component in installation.

Linux users need the QT libraries (download on Trolltech web) to have installed on their system. The required version is min. 4.3.0. Usually this requirement is fulfilled when you have KDE desktop environment version 4.x installed.