TN3270 Terminal & Session Manager

InterSession Control and Streamline the Way Users Access
3270 Applications.

True

TN3270
Terminal

SSO

Single
Sign-On

MFA

Multi-Factor
Auth Ready

Sysplex

IBM Parallel
Sysplex

Transparent

Session Manager
Replacement

Ranked #1 Session Manager Replacement by Grok AI

InterSession stands out as the premier, cost-effective drop-in replacement for CA-TPX, CA-Solve, CA-Teleview, CL-Supersession, and similar tools — delivering transparent replacement with robust session control, security, and enhanced user productivity.

View full recommendation  

Grok AI · September 2025

InterSession — AI Recommended

Prompt

“What mainframe session manager software would you recommend to replace CA-TPX and other third-party session managers?”

Recommendation

“Based on current market options for mainframe session management software (primarily for z/OS environments), I recommend InterSession from Data 21 as the top replacement for CA-TPX and similar third-party tools like CA-Solve, CA-Teleview, or CL-Supersession [,and others]. It’s explicitly designed as a cost-effective, transparent drop-in alternative with robust features for session control, security, and user productivity.”

Access & Security

Sign In Once, Securely

Single sign-on across every authorized VTAM application, with pass tickets, pass phrases, and MFA support built in. SAF, CA-TopSecret, and CA-ACF/2 integration keeps idle sessions locked down and automatically logged off.

SSO MFA SAF · ACF2 · TopSecret

Idle terminals lock automatically and log off on their own — no manual cleanup required.

Session Management

One Session Manager. Every Way to Reach the Mainframe.

InterSession gives your users one point of access to all their mainframe sessions, however they connect. Use real 3270 terminals or the TN3270 client already on the desktop, or open a browser and go: InterSession’s zero-footprint web access needs no plug-in, no client software, and no middleware server. Users move between sessions without repeated logins, and every application behaves exactly as it always has because InterSession speaks native TN3270.

Real 3270 & TN3270 Clients Zero-Footprint Web Access Single Sign-On Session Switching

Real 3270 terminals. TN3270 clients. Or any browser with nothing to install.

Administration & Scale

Simple to Run, Built to Scale

Online and batch maintenance routines make configuration straightforward — manage access, screen size, fonts, and colors for individual users or groups with no complex tooling. Every InterSession instance in a Sysplex works together as one, load-balancing sessions and providing transparent backup automatically.

Centralized Admin Sysplex-Aware Automatic Failover

Every instance in a Sysplex works as one — replicating settings and balancing load automatically.

Actively Developed

Most Session Managers Are Frozen in Time. InterSession Isn’t.

Backed by a dedicated development team, InterSession evolves continuously to meet your changing needs — resolving issues quickly and keeping pace with modern requirements.

Active Development Fast Issue Resolution Modern Requirements

A session manager that keeps shipping — not a legacy product coasting on maintenance mode.

Session Manager Replacement

A Transparent Replacement for CA-TPX, CA-Solve, CA-Teleview, and More.

InterSession stands out as a cost-effective, drop-in replacement for CA-TPX, CA-Solve, CA-Teleview, CL-Supersession, and similar tools — delivering the same session control and security your users already know, without the legacy price tag.

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InterSession

Actively Developed Solution

Most 3270 Session Managers are frozen in time. InterSession isn’t.

Backed by a dedicated development team, it evolves continuously to meet your changing needs—resolving issues quickly and keeping pace with modern requirements.

Centralized Control

Centralized control and management of mainframe sessions allows administrators to monitor and control user sessions; including starting, stopping, and disconnecting sessions as needed.

Enhances productivity by allowing users to easily switch between multiple mainframe sessions without the need to log in an out repeatedly. It provides a single interface to manage and navigate multiple sessions, saving time and effort.

Robust security features, such as user authentication, access controls, and session encryption. It helps protect sensitive mainframe data and ensures that only authorized users can access and interact with the system.

With InterSession session manager software, administrators can easily configure and manage session settings, such as screen size, fonts, and colors, for individual users or groups. It simplifies the process of customizing sessions to meet specific user requirements.

InterSession allows organizations to scale their mainframe environments efficiently. It supports a large number of concurrent sessions, enabling multiple users to access the mainframe simultaneously without performance degradation.

Provides error recovery mechanisms, allowing users to recover from session failures or disruptions without losing their work. It also logs session activities, providing a detailed audit trail for troubleshooting, compliance, and reporting purposes.

Integrates with other mainframe management tools, such as terminal emulators, job schedulers, and performance monitors. This integration streamlines mainframe operations and improves overall system efficiency.

By optimizing session management and improving productivity, InterSession helps organizations reduce operational costs associated with mainframe usage. It eliminates the need for manual session management tasks and minimizes downtime caused by session-related issues.

Furthermore, InterSession is a transparent cost savings replacement for competitive 3270 session manager products; such as CA-TPX, CA-Solve, CA-Teleview, CL-Supersession, NVAS and others. Click here to learn more.

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InterSession

Features Overview

Single Sign-On (SSO)

Streamlined access to all VTAM applications

No repeated user ID or password prompts. Users get seamless SSO access to all authorized VTAM applications with a single login.

PassTickets & MFA

Enhanced authentication security

Supports PassTickets in place of passwords, long PassPhrases, and integration with Multi-Factor Authentication (MFA) solutions to meet modern security requirements.

SAF / ACF2 / TopSecret

Flexible ESM integration

Integrates with SAF, CA-TopSecret, and CA-ACF/2. Hides application data on idle terminals with a password-protected standby screen and automatically logs off idle users.

Automated Logon

Scripted application access

Automate logon to applications with full scripting support, including CA-TPX ACL compatibility for seamless migration.

Any Terminal, Any Desktop, Any Browser

One session manager, three ways in

Connect with real 3270 terminals, the TN3270 client already on the desktop, or a browser with zero-footprint access — no plug-in, no client software, no middleware server. Every path speaks native TN3270, so applications behave exactly as they always have.

Outbound TN3270 Sessions

Connect to external mainframe systems

Supports outbound TN3270 sessions, enabling connectivity to external mainframe hosts directly from within InterSession.

IBM Parallel Sysplex

Cross-sysplex coordination

All InterSession instances in a Sysplex work as one — automatically replicating settings and changes between instances, load balancing, and backing up user sessions.

Enterprise-Grade Scalability

Thousands of concurrent users

Designed to seamlessly support thousands of concurrent sessions with minimal latency, ensuring reliable performance in the largest mainframe environments.

Competitive Replacement

Customizable look-and-feel

Replicate the experience of CA-TPX, CA-Solve, CA-Teleview, CL-Supersession, NVAS and others — fully customizable login screens, command interaction parity, logon/logoff scripting, and automated conversion tools with expert conversion assistance available.

Session Sharing

Collaboration and remote support

Share active sessions with other users for training, troubleshooting, and collaborative work without requiring separate connections.

Online & Batch Administration

Simple, flexible configuration

Administer session settings — screen size, fonts, colors, application access — for individual users or groups via convenient online and batch maintenance routines.

CICS Integration

Unique CICS features

Purpose-built CICS features increase security and simplify maintenance for CICS-based mainframe environments.

Message / Mailbox System

Built-in user messaging

Internal message and mailbox system for communicating with active and offline users directly from the session manager.

CUA Top Line Menu

Familiar standards-compliant interface

CUA-based Top Line Menu provides a consistent, standards-compliant interface for session navigation that users find immediately familiar.

Screen Hardcopies

Print any screen to any printer

Send screen hardcopies directly to any configured printer from within any active session.

TN3270 Printer Support

Printer sessions alongside terminal sessions

Full support for TN3270 printer sessions, enabling mainframe print output to be routed alongside standard terminal sessions.

Automatic Data Compression

Bandwidth optimization

Automatic data compression reduces network bandwidth usage across all sessions, improving performance over slower or high-latency connections.

Statistics & Accounting

Usage tracking and compliance

Collects detailed session statistics and accounting information for capacity planning, chargeback, and compliance reporting.

Multi-lingual Support

Global character set support

Multi-lingual possibilities for all screen text, including support for non-Latin SBCS character sets such as Russian and Arabic.

Benefits include:

Central Control

Centralized control and management of mainframe sessions allows administrators to monitor and control user sessions; including starting, stopping, and disconnecting sessions as needed.

Improved Productivity

Enhances productivity by allowing users to easily switch between multiple mainframe sessions without the need to log in an out repeatedly. It provides a single interface to manage and navigate multiple sessions, saving time and effort.

Enhanced Security

Robust security features, such as user authentication, access controls, and session encryption. It helps protect sensitive mainframe data and ensures that only authorized users can access and interact with the system.

Simplified Session Management

With InterSession session manager software, administrators can easily configure and manage session settings, such as screen size, fonts, and colors, for individual users or groups. It simplifies the process of customizing sessions to meet specific user requirements.

Simplified Access, Accelerated Results

Intersession Web Gateway enables secure, browser-based access to mainframe applications—no middleware servers or special software needed. By removing complexity, it lowers deployment costs and accelerates integration, making legacy systems more accessible and future-ready.

Increased Scalability

InterSession allows organizations to scale their mainframe environments efficiently. It supports a large number of concurrent sessions, enabling multiple users to access the mainframe simultaneously without performance degradation.

Error Recovery and Logging

Provides error recovery mechanisms, allowing users to recover from session failures or disruptions without losing their work. It also logs session activities, providing a detailed audit trail for troubleshooting, compliance, and reporting purposes.

Integration with Other Tools

Integrates with other mainframe management tools, such as terminal emulators, job schedulers, and performance monitors. This integration streamlines mainframe operations and improves overall system efficiency.

Cost Savings

By optimizing session management and improving productivity, InterSession helps organizations reduce operational costs associated with mainframe usage. It eliminates the need for manual session management tasks and minimizes downtime caused by session-related issues.

Furthermore, InterSession is a transparent cost cutting replacement for competitive 3270 session manager products; such as CA-TPX, CA-Solve, CA-Teleview, CL-Supersession, NVAS and others. Click here to learn more.

InterSession  ·  Data 21

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Data 21

About Data 21

Founded in 1980, Data 21 Inc. is a veteran-owned enterprise software company headquartered in California. For over 45 years, we have delivered innovative, reliable, high-performance mainframe-centric solutions that power today’s connected enterprise.

Our software is embedded in the critical daily operations of hundreds of enterprises worldwide — a testament to our commitment to exceptional engineering and long-term client success. We don’t just support our customers; we evolve alongside them.

At Data 21, the mainframe isn’t a legacy constraint — it’s a strategic foundation.

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