Replication Server uses two major types of functions.
The major Replication Server types of functions are:
System functions
User-defined functions
You can create custom function strings for either type of
function, depending on your needs.
System Functions
System functions represent data server operations that use function strings supplied by Replication Server or are available when you install a new database on the replication system.
User-Defined Functions
User-defined functions allow you to use Replication Server to distribute replicated stored procedures between sites in the replication system.
Function Scope
The scope of a function defines the object to which the function applies: a replication definition or a function-string class.