Command/setupinmargin

\setupinmargin

Syntax

\setupinmargin[...][...,...=...,...]
[...]	left right number
location	left right both
style	normal bold slanted boldslanted type cap small... command
before	command
after	command
align	inner outer left right middle normal no yes
line	number
distance	dimension
separator	text
width	dimension
distance	dimension
stack	yes no
[...,...=...,...]	see \setupframed

Example

% For example:
\setupinmargin[style=slanted]

\starttext

This is an example of a simple margin note set in the slanted font
of the document. If used correctly, the note \inmargin{Here is a
simple margin note.} should print on the side with the command 
\type {\inmargin} placed in the text. You will of course want to 
adjust your margins to accommodate the type.  

\stoptext