Use to specify the high-level qualifier for the dynamic allocation of data sets in TCPIP; TCPIP.V2R10, for example.
Rules:
The default high-level qualifier distributed with the system is TCPIP.
The maximum length of the data set prefix is 26 characters.
The data set prefix consists of one or more character strings separated by dots (periods).
The maximum length of a character string is 8 characters.
The first character of a character string must be one of $@# or an alphabetic letter.
Each subsequent character of a character string must be one of -$@# or an alphanumeric.
The last character of the data set prefix must not be a period.