By stored procedure, do you really mean the way in which SPaTs are implemented in Adabas, or are you approaching this from an understanding of stored procedures as they are implemented in other DBMSs (like Oracle)? My assumption here is that it’s the latter.
You cannot create something like a PL/SQL object and store it in Adabas and execute it… that functionality does not exist. Adabas SQL Gateway, the product under which this topic is filed, allows for SQL statements in programs to be used to select from Adabas as a data source.
Adabas does have stored procedures. They are implemented as Natural subprograms and can be invoked by calling the TSP entry point. If you wanted to invoke it from a web front end you would need to determine which integration or modernization approach best fits your needs.
I am unclear what your needs are.