Because HCL Sametime is middleware, it supports application and business process integration.
HCL Sametime Connect can run under Microsoft Windows, Linux, and macOS.
Also available are a zero-download web client for Microsoft Internet Explorer, Mozilla Firefox and Apple Safari; mobile clients are also supported for Apple iPhone, Android, Microsoft Windows Mobile, RIM Blackberry, and Symbian.
Sametime can also be accessed using the free software Adium, Gaim, Pidgin, and Kopete clients.
The next major release was the Sametime v7.5 client, built on the Eclipse (software) platform, enabling the use of the plug-in framework.