Initiates an XID test between the system specified by the LAN
    Address described below.  If you optionally chose to enter a
    Client Name in the previous menu, the default test parameters for
    this operation were obtained by looking up the information for that
    MOP Client, and those parameters are present in the current display.

    The required arguments for this test operation are:

     o  Address

        The LAN address of the target node on the circuit named in the
        circuit argument.

     o  Circuit

        The MOP circuit you have currently selected for the test operation.

     The optional arguments for this test operation are:

     o  Client

        A client entity to be used for this operation, if you provided one
        in the previous display.

     o  Count

        An Integer representing the number of test messages to be sent.

     o  Format

        Value of each byte in the data part of each test message.
        The default results in alternating 0 and 1 bits.

     o  Length

        Integer representing Length of the data part of each test
        message. The maximum and minimum permitted values depend on the
        particular data link in use.

     o  SAP

        An octet representing the Service Access Point (on the target
        system) to which the XID message is to be sent.

    Pressing the OK button will cause the test command to be executed and
    will return control back to the main window.

    Pressing the RESET button will cause all the arguments to be reset back
    to the state they were in when you first entered this display.

    Pressing the CANCEL button will return you to the main window.  No test
    command will be issued.