Three main modifications of the ``TROLIS'' system

There are three main modifications of the ``TROLIS'' system ,whose interface depends on agency's needs and financial possibilities. Below is a short description of these variations for future references when we'll talk about their specific features:

• [GUI]- Graphical User Interface - graphical client for Windows 95/98/NT/2000, which works with external database in ``Application Server'' mode. The most complete and preferable client application. System management and administration task are implemented only in this mode.
• [CHUI]- CHaracter User Interface - terminal (character) client, which works with database server in direct (host) mode and is accessible via any terminal emulator. This mode is operating system independent.
• [CHUI/AS]- CHaracter User Interface - terminal (character) client, which works through intermediate (local) database server, which in it's turn operates with remote database server in``Application Server'' mode. This variation is the mostly suitable for the large agencies, which haves low connection to the main server or due to some reasons cannot have a GUI client running on each workplace. Installation of that type of client requires installation of local database server and thus requires a license from PROGRESS Software Corporation. The local server hardware may have not very high performance. It may be middle performance UNIX or Linux (preferable) server.

System installation also includes statistics module which is designed in WEB interface and is to be installed on the database server computer. Only privileged users can access this module. Statistics module is designed to generate information about the overall amount of passengers and cars carried by ferry line on per voyage, week or month basis, as well as per ferry and ferry line basis. There also available reports on nationality and agency consistence of each voyage. Passenger and transport lists are also available in the voyage statistics reports..

System does not include Internet booking module. This module is optional. The design and implementation of it depends on a particular customer. Even more problematic would be On-line ticket payment implementation, as well as booking validity confirmation. These questions goes out of scope of programming and are questions of business organization.