smbclient queries

[anand narayan vidwansa]

Hi,
     i am a newbie to samba.i have a lan with 3 machines.my samba server runs perfect.there's no problem.the smbclient program works as well and i can mount easily from windows machines.
           i want to know 
* where in the samba package is the code for smbclient???
* what is libsmbclient???
* where is the code for libsmbclient???
* what is the purpose of 'testsuite' directory in the samba package     because it contains a subdirectory named libsmbclient/src which contains some c source files???
                     thanking you...
                                      anand