Hello,
Mainly nxserver.log is where nxserver/nxnode processes write their logs, and nxerror.log is where stderr of all commands run by nxserver/nxnode is redirected. You can control log level by altering SessionLogLevel in server.cfg/node.cfg or use –debug procedure to enable debug log level of nxserver, nxnode, nxwebplayer and nx display agent process. The debug level prints more verbose logs, while the informational log level (default) prints mainly warnings and errors. Does this answer your question? If not, please provide more details about what you need to know.