For a description of the functionality offered by the OAL please consult the OAL User Documentation.
followed by a statement
in the file taskname_description.tex. The externalref command produces a cross reference to the relevant documentation in the OAL package. For this to work, in addition, the file taskname.tex must contain a statement
where ... must be replaced by the relative path from the directory containing the task's HTML documentation to the SAS top-level package directory (usually ../../..).