Contents of registers at exit

The contents of registers at exit are as follows:

Registers 0-14: Restored to condition at entry.

Register 15:    Return code:
                00 - Use the LU name in the parameter area.
                08 - LU name is not to be used

If the name of the LU contains fewer than 8 characters, pad with blanks to the right to provide a name with 8 characters. The LU exit routine must save and restore the contents of registers 2-14 when receiving and passing control. Do not modify any values in the parameter list other than the LU name field. Do not alter more than the 8 bytes needed for the LU name. The R15 return code indicates to Telnet what action to take.