InterSession Web Gateway

Say Goodbye to ...

TN3270 clients & middleware,
TN3270 admin & support overhead,
TN3270 interdepartmental logistics,
TN3270 security vulnerabilities,
and more,
with InterSession Web Gateway Mainframe based 3270 Emulation
  • No installation or support required outside the mainframe
  • Securely delivers 3270 screens as HTTPS web pages simulating true 3270 TE functionality
  • Standard web browser is the client - no plugins or middleware
  • Free iPad & Android Apps for best Tablet UX
  • Significant savings over TN3270 Emulators
Web Gateway Introductory Guide

Over 40 Years of Mainframe Solutions

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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