P.READ - privileged file read.

iostat = p.read( buffer, filecode, sector
                [, words, errfnc] );

buffer: is a pointer to the memory location where input data should be placed.
filecode: is the TSS filecode that you wish to read. This will either be one of TSS's filecodes (e.g. #D) or a filecode returned by DRL JOUT.
sector: is the sector within the file where the reading should start.
words: is the number of words to read. If omitted, "words" defaults to 320.
errfnc: is a function that is called with a PRINTF style call if there is an I/O error while reading the disk. If omitted, it defaults to .ERROR, which will terminate the program.
iostat: is the negative of the major status from the read. A non-zero value is only returned if you supply an "errfunc" that does not terminate the program.

P.READ allows a privileged TSS program to read from a TSS file code using DRL PDIO. The function is not available in batch.