IBM WS525 manual Multiple Sessions, Overview

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2

Multiple Sessions

2.1 Overview

Multiple sessions extend the WS525 to act like four terminals in one. A session is an active connection between the terminal and a host system. See Figure 1–3.

The WS525 supports up to four sessions using virtual terminals. Each virtual terminal maintains the full keyboard and display state of a real physical terminal but shares a single keyboard and display with other virtual terminals. Before you can login using a virtual terminal, it must be connected to a host computer.

WS525 session virtual terminals can be connected directly to a host computer through any of the three serial communication ports on the back of the terminal. Since there are only three comm ports, this method alone can only support three sessions.

To use a fourth session or to reduce the number of serial comm lines needed, more than one session must be connected through a single comm port. The WS525 allows this using a session management protocol, called TD/SMP (Terminal Device/Session Management Protocol). TD/SMP allows two or more sessions to share a single comm line, as long as the other end of the comm line supports the protocol. To enable TD/SMP at the terminal, you simply assign more than one session virtual terminal to the same comm port in Set-Up.

TD/SMP is available on most terminal servers or host systems with SSU software. If you are using a terminal server, check with its documentation to determine if it can run TD/SMP.

Multiple Sessions 2–1

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Contents Asynchronous Color Terminals WS525 User Guide Publication Issued by Contents Tables Maintenance and TroubleshootingDeﬁning Keys SpeciﬁcationsBefore You Start PrefaceOverview EnvironmentConventionMeaning Proper Setup and UseConventions Important InformationKeyboard Recommendations for Proper Setup and UseAdjust So that your ChairAdjust Cont Recommendations for Proper Setup and UseIf desired, install the system box in its stand Installation and Set-UpConnect the cables to the system box InstallationConnect the cables to the monitor ANSI-Style Keyboard Layout KeyboardsOn a Press Refer to Set-UpOverview Entering/Exiting Set-UpMenu Indicates Moving within a Set-Up MenuSelect the Set-Up language Conﬁguration DefaultCommunications Port Set-Up Screen If you want to From the Color submenu in Set-Up Choose Using ColorFrom the Color submenu in Set-Up, choose Save your settingsRestore previously saved settings Restore Select menu itemMultiple Sessions Opening Another Session Using a Terminal Server with TD/SMPUsing SSU Host Software At the Local prompt, enter the following commandTips for Using Multiple Sessions Page Invoking Desktop Features Desktop FeaturesKey Function Clock featureFormat KeyFunction Calculator featureBanner message Show Character Sets featureAnsi Keyboard PC Keyboard Press Keyboard SummaryCopy and paste Review previous lines Accessibility aidDeﬁne Key Editor Deﬁning KeysMoving Standard Functions Function Keys Creating a New FunctionDeﬁne Key Editor, Select Function Creating a Key Sequence4Deﬁning Keys Cleaning your Video Terminal Maintenance and TroubleshootingTroubleshooting Accessibility aid Troubleshooting TableTable A-1 Identifying and Correcting Problems Symptom Possible Cause Suggested SolutionIntroduction Installing the ROM CartridgeTable A-1 Cont. Identifying and Correcting Problems Installing and Removing the ROM CartridgeMaintenance and Troubleshooting Installing the ROM Cartridge System Unit SpeciﬁcationsElectrical Requirements Operating TemperatureMonitor Requirements KeyboardEIA Power CordsCommunication/Printer Ports Order Number Country Amp LengthFigure B-1 Comm1-Serial Communication/Printer Ports Table B-1 Standards Conformance and Approvals Standards ConformanceType Standard Subject A. Dhhs FDA Table B-1 Cont. Standards Conformance and ApprovalsDisposing of your Terminal