All results in Forecast Server are contained in SAS data sets. As long as your client can consume SAS data sets, there is no need to access the applications. You can also create costum reports for the clients. Again, the results will be saved to SAS data sets. You can convert the SAS data sets to various other formats, such as excel spreadsheets, with PROC EXPORT if your client does not have a way to read SAS data sets.