The Mac OS 9.1 Installer installs USB Support 1.4.4 if it detects an OHCI-compliant USB card. The USB OHCI (Open Host Controller Interface) is an industry standard for defining how manufacturers may create a USB controller for the PCI bus.
USB Support 1.4.4 should allow a compliant device to work without additional software. However, if a third-party manufacturer provides additional software, you should consult the third-party's support materials to determine which course of action is best for your system configuration.