If set, this resource defines a pr3287 printer session to start as soon as the host session enters 3270 mode.
If printerLu has the value
., the printer session will be associated with the current interactive session.
The session must use the TN3270E protocol in order for this option to work.
Otherwise, printerLu is interpreted as the name of a Logical Unit for pr3287 to negotiate when it connects.