Using Apl Shared Variables - IBM 5110 User Manual

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USING APL SHARED VARIABLES
Once a shared variable is established as the connection between the
active workspace and the I/O processor, you can do the following
input and output operations:
• Create a new sequential access or direct access data file .
• Add data to an existing data file .
• ' Read data from a sequential access data file .
• ' Read-only data from a direct access data file.
II
Update (read and write) data in a direct access data file.
II
Read data from and write data to the display screen.
.. Send data to the printer.
The first value assigned to the shared variable must be a character
string (enclosed in single quotes) that specifies the operation to be
performed. Specifying the operations to be performed and doing
input/ output operations are discussed next.