This is a storage space to associate names with arbitrary data. What data you associate is reserved for your application. ScriptEase: Desktop, for instance, stores a number of pointers with names.
You are allowed to retrieve and store values to SE.SERVICES,SE.VALUE. This is a single slot that is accessed more quickly than the others. However, there is only one such slot. Therefore, an application writer is given that slot for his application. Any utility function library that need to associate data with a context must use a named member of the SE.SERVICES object to store its data.