\showframe

\starttext 

This is a very simple document typeset using the default 
layout settings. If you want to see more of the layout, you 
can say:

\starttyping
\showframe
\stoptyping

When setting up a layout \type {\showframe} and \type 
{\showlayout} can save a lot of trial and error. The default 
layout is asymmetrical. 

\stoptext 
