The :cursor function set
locate [EXPR, EXPR] 
Sets the cursor position. The first argument is its row number, and the second one its column number. If omitted, the cursor will be located at (1,1).

up [EXPR] 
down [EXPR] 
left [EXPR] 
right [EXPR] 
Moves the cursor toward any direction for EXPR characters. If omitted, EXPR is 1.

savepos 
loadpos 
Saves/restores the current cursor position.

The :screen function set
cls 
Clears the screen with the current background color, and set cursor to (1,1).

clline 
Clears the current row with the current background color, and set cursor to the 1st column.

clup 
Clears everything above the cursor.

cldown 
Clears everything below the cursor.