Data processing: structural design – modeling – simulation – and em – Emulation – Compatibility emulation
Reexamination Certificate
1998-10-30
2001-04-10
Teska, Kevin J. (Department: 2763)
Data processing: structural design, modeling, simulation, and em
Emulation
Compatibility emulation
C709S241000, C710S105000, C370S466000, C370S469000
Reexamination Certificate
active
06216101
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates in general to the field of electronic systems, and more particularly to a server and a web browser terminal emulator for persistent connection to a legacy host system and a method of operation.
BACKGROUND OF THE INVENTION
Many organizations operate computer network environments that include legacy host systems which store data and provide applications important to the operation of the organization. Such legacy host systems can include IBM mainframes (MVS, VM and VSE environments), IBM AS/400 systems and UNIX host systems.
It is desirable for such organizations to provide connection to the legacy host systems through terminal sessions on distributed client systems such as personal computers and computer workstations. This connection to the legacy host system provides access for users of the client systems to the data and applications on the legacy host system. These terminal sessions can include 3270, 5250, NVT and VT220 type terminal sessions.
One conventional method for providing terminal sessions is to execute a terminal emulator application on the client systems that connects directly to a host legacy system using a TCP/IP socket connection. Another conventional method is to provide connection through a web browser application by translating standard legacy data flows into HTML pages. However, such conventional web browser methods suffer from an inability to handle real-time host updates to user screens as well as other significant problems. For example, forms-based HTML/TN3270 packages are unable to overcome a range of problems associated with common HTML implementations such as real-time host updates to user screens or finding a user's browser platform address on the network.
SUMMARY OF THE INVENTION
One aspect of the invention is a computer-implemented terminal session emulator for providing browser-based access to legacy host applications. An emulation server is in communication with a web server, by being built into an existing web server or otherwise. The emulation server negotiates a persistent connection between a legacy host system and a client system. Applet code is operable to create an applet process executing under a web browser on a client system. This applet code is downloadable to the client system in response to receiving a uniform resource locator associated with the legacy host system. When executed by the client system, the applet process is operable to communicate with the emulation server to provide a terminal session to a user of the client system via the persistent connection. The applet process has an associated protocol that handles communications between the applet process and the emulation server. The emulation server is further operable to generate a client token, to pass the client token to the client system, and to refuse the persistent connection if the applet process does not return the client token.
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Burris, Jr. Stuart H.
Butts Thomas H.
Zuefeldt Paul C.
Baker & Botts L.L.P.
Frejd Russell W.
Openconnect Systems Incorporated
Teska Kevin J.
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