Lenovo ThinkPad i Series 1157 ThinkPad 570 User's Reference - Page 115

Extending features: UltraBase and Port Replicator with Advanced EtherJet Feature Attaching to or detaching from the UltraBase and the Port Replicator with Advanced EtherJet Feature You can hot- or warm-dock or -undock the computer to or from the UltraBase and the Port Replicator with Advanced EtherJet Feature under the following conditions: With your computer powered off (cold docking or undocking) With your computer in suspend mode (warm docking or undocking) With your computer operating (hot docking or undocking) Hot Warm Cold Dock Yes Yes Yes Undock Yes Yes* Yes * You can undock your computer from the UltraBase-port replicator assembly, or undock the computer-UltraBase assembly from a port replicator, while the system is in suspend mode. The system resumes and starts processing for undocking (hot-undocking). The system reenters suspend mode when it completes the process. Windows 98 (APM mode) and Windows 95 (Version 2.0 or later version) support hot- or warm-docking or -undocking. You need to cold-dock or -undock the computer to or from these options if you use a different operating system. Chapter 2. Using your computer and extending its features 99