>SET COVERAGE permits me to track an application, but i want not to track my application i want only to know when an error occurs on which lines the programs where called. when i call set coverage at the begin of my error procedure i do not have all the lines.

Maybe something like, but suited to your app:
ON ERROR do cgiError with oCGI, oFrm, error(), message(), program(), lineno(), dberror(), dbmessage(), wtEMailName, wtEMailAddress