The workspace consists of a series of blocks separated by horizontal lines. Each block handles one expression and is split into two parts: the edit area and the evaluation area . The menu option Insert Block (Section 4.2) creates a new block; additionally, evaluating the expression in the bottom-most block creates a fresh block at the end of the workspace.
The current block's Scheme expression is in a bold, blue font. A different block can be selected by either clicking in it with the mouse or by using the hot keys M-v and C-v (where M is the meta/alt key, and C is the control key) to move to the previous and next blocks, respectively.