A set of commands for displaying and manipulating HDS objects. These are general facilities and no assumptions are made about the structure of the HDS datasets used.
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: (VMS) or $AST_DOCS (UNIX) for a description of what you will find in ASTERIX files.