xtruss: xtruss (easy to use X protocol tracing program)
xtruss:
xtruss: XTruss logs everything that passes between the X server and one
xtruss: or more X client programs.  In this it is similar to xmon(1), but
xtruss: intended to combine xmon's basic functionality with an interface
xtruss: much more similar to strace(1).
xtruss:
xtruss: http://www.chiark.greenend.org.uk/~sgtatham/xtruss/
xtruss:
xtruss:
xtruss: