A 'Current Object' is stored in the Global parameter HDSOBJ and most commands will present this as the default object to be taken as input. If a different object is specified this will subsequently become the Current Object.
You can obtain a description of HDS in SUN92. See also the 'Standard ASTERIX Structures' document "prog_002" in $AST_DOCS/Programmer for a description of what you will find in ASTERIX files.
Subtopics: