When you run setup.exe on a server, the installation program does the following:
Detects that the computer is a server and that Active Directory is installed.
Installs ssommc.dll, which is the SecureLogin snap-in to MMC.
Registers ssommc.dll.
In addition to using MMC, you can use slmanager.exe to administer SecureLogin for Active Directory. This utility is found in the \securelogin\tools directory.