Part of the STS-102 mission is take up the Expedition Two crew and bring back the Expedition One crew and is among the mission's top priorities. Expedition One Commander Bill Shepherd, Soyuz Commander Yuri Gidzenko and Flight Engineer Sergei Krikalev will be replace by Expedition Two Commander Yury Usachev and Expedition Two flight engineers Susan Helms and Jim Voss.
The transfer will take place in a carefully orchestrated, one-at-a-time process that ensures three current members of the station crew will be able to come home, at any time during the switch, aboard the Soyuz spacecraft attached to the station. Expedition Two crewmembers officially joint the station when they install their seatliners in the Soyuz.
This NASA downlink, taken on the 10 March 2001, features the docking of the Shuttle Discovery with the International Space Station, Shuttle and ISS crew meet and greet, and the installation of Yury Usachev seat liner into the Soyuz capsule as he officially joins the station. The video comprises of

01:45:21:02 to 01:49:05:24 Crew Activity Report
01:49:06:00 to 02:02:56:12 Flight Day 3 Highlights