Explain about SYSVAR
>>-SYSVAR(arg_name)--------------------------------------------><
1. SYSVAR returns information about MVS�, TSO/E, and the current session, such as levels of software available, your logon procedure, and your user ID.
2. The information returned depends on the arg_name value specified on the function call.
3. The arg_name values are divided into the following categories of information: user, terminal, exec, system, language, and console session information.
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