@READSCR[row,col,length]: Returns the text displayed in the TCC window at the specified location. The upper left corner of the window is location 0,0. The row and column can be specified as an offset from the current cursor location by preceding either value with a [+] or [-]. For example:
returns 10 characters from the screen, starting 2 rows above and 2 columns to the right of the current cursor position.