Source: xtrace Section: x11 Priority: optional Maintainer: Bernhard R. Link Build-Depends: debhelper (>= 10) Standards-Version: 4.3.0 Package: xtrace Architecture: any Depends: ${shlibs:Depends}, ${misc:Depends} Suggests: xauth Description: trace communication between X client and server What strace is for system calls, xtrace is for X11 connections: you hook it between one or more X11 clients and an X server and it prints the requests going from client to server and the replies, events and errors going the other way.