Say I have two documents open. Document A is long and occupies more than one screen. Document B is short. If I switch from tab A to tab B, not all the screen is redrawn: there is document B on the top half, while in the bottom half there is still part of document A.
Pretty figure: Screen displaying document A: AAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAA Screen displaying document B: BBBBBBBBBBBB BBBBBBBBBBBB ............ ...(empty).. ............ After switching from A to B: BBBBBBBBBBBB BBBBBBBBBBBB AAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAA -- Andrea Censi "Life is too important to be taken seriously" (Oscar Wilde) Web: http://www.dis.uniroma1.it/~censi