Table 3: AOPTIONS

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Bits	Value	Meaning	Comment
8:2	01	Exclusive	The process opening the file demands exclusive access to the file. Other processes will not be able to access it while you have it open.
8:2	10	Exclusive allow read	The process opening the file is the only one that can write to the file. Others can read the file while you have it open.
8:2	11	Share	The file is shared. Others can read or write the file. The FLOCK intrinsic should be used to avoid corruption.
10:1	0	No FLOCK allowed
10:1	1	FLOCK is allowed
12:4	0000	Read only	This file is opened for read access (FREAD is used to read the file).
12:4	0001	Write only	This file is opened for write access (FWRITE is used to write new records to the file).
12:4	0011	Append only	This file is opened for append access (like write access, but records are appended to the end of the file instead of replacing them).
12:4	0100	Read/Write	This file is opened for read and write access (FREADDIR and FWRITEDIR will be used to access the file).
12:4	0101	Update	This file is opened for update access (FUPDATE is used).