The HP 64700A is re-useable. You can remove and install different emulators and analyzers. The unit provides a low-level user interface, called the Terminal Interface, which resides in firmware. The Terminal Interface lets you control 64700 Series emulators and analyzers from any computer on the LAN with telnet software, from any computer with an RS-232 or RS-422 interface and terminal emulation program, or from an RS-232 data terminal