Use to specify the TCP host name of this z/OS server; for example, MVSADM1.
Rules:
If not specified, defaults to the nodename specified in the IEFSSNxx PARMLIB member.
The maximum length of the host name is 66 characters.
The host name consists of one or more labels separated by dots (periods).
Each label must be at least one character long.
The first character of a label must be alphanumeric.
Each subsequent character of a label must be an alphanumeric or a hyphen.
The last character of the host name must not be a period.