Use the GO command to select a current message base.  When selecting a base,
use a name obtained from the BASES command.  The go command is of the format:
GO <basename>
Note that you only must supply an identifying portion of the base name.  For
example, if you want to select a base called COMPUTE, the following would
be valid:

GO COMPUTE
GO COMP
GO COM

In addition, you may leave out the word GO completely.  For example,

COMPUTE
COMP
COM

Once the current base has been selected, it will be displayed at the main
prompt. 
COMPUTE>      or       COMPUTE!DIR>
In the second case, DIR is the name of the currently selected download
directory (always preceeded by an exclamation point).
