Southern Africa/Africa: Should Africa open its borders?

Botswana is constructing an 8-foot high electric fence along its border with Zimbabwe at a time when many Zimbabweans are crossing over to Botswana in search of a better life. On 15 September 2004, BBC Africa Live asked: Do you want tighter border controls in your country? Or should Africans be able to go wherever they want on the continent? What are the consequences of tighter border controls to a more united Africa?