QZSOSIGN and QZSOSGND are <a href=”http://publib.boulder.ibm.com/infocenter/iseries/v5r4/index.jsp?topic=/rzaii/rzaiimst23.htm”>Signon Server</a> jobs. The Signon server provides password management functions for i5/OS host servers with sockets support.
The Signon server provides security for clients. This security function prevents access to the system by users with expired passwords, validates user profile passwords and returns user profile security information for use with password caching and iSeries Navigator Application Administration.
(Taken straight from the embedded link. Found by typing “qzsosign” into the Information Center Search box.)
If, however, you actually have jobs named “QZOSIGNON” rather than QZSOSIGN or QZSOSGND, then you should be asking the person who started the jobs on your system rather than asking here. No one here will know what those jobs are.