An alias is an alternate name that can be used to make a connection. The alias encapsulates the required elements of a connection string, and exposes them with a name chosen by the user. Use the Alias page on the <Alias name> Properties dialog box to view or specify the elements of connection string of an Alias.
The name (alias) that you want to use to refer to this connection.
Pipe Name / Port No / VIA Parameters
Additional elements of the connection string. The name of this box varies with the selected protocol. See the topics listed below for examples.
The VIA protocol is deprecated. This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
The protocol used for the connection.
The name of the Microsoft SQL Server instance being connected to.