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All sessions are established using the open command. At its simplest, the open command specifies the primary and secondary servers for the session:

<pre>
open logical1=hostname logical2=hostname
</pre>

In this example, logical1 and logical2 are the user-assigned logical names of the primary and secondary servers, respectively. Each of these parameters is set to the host name or IP address of the corresponding server.

For two-party transfer sessions, where the UDM Manager acts as the primary server, hostname is not the host address of the local machine (this would initiate a three-party transfer with the primary server running on the local machine). Instead, the host address is either the name local or the asterisk ( * ) character:

<pre>
open machine1=* machine2=somentmachine
</pre>

In this example, a two-party transfer session is established between the UDM Manager, acting as the primary server with the logical name machine1, and another machine with the host name somentmachine, with the logical name machine2.

An alternate method of establishing a two-party transfer is simply to give the secondary server as a parameter to the open command:

<pre>
open machine2=somentmachine
</pre>

In this example, a two-party transfer session is implied. In such cases, the logical name of the UDM Manager / primary server side of the transfer session always will be local.

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<pre>
open machine1=somemvsmachine machine2=somentmachine
</pre>

In this example, a three-party transfer session is established between a machine with the host name somemvsmachine, given the logical name machine1, and a machine with the host name somentmachine, given the logical name machine2.

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