<handle> get ?-dimensions? <name1> ?<name2> ...?
Returns a list of all named datasets. Every element of the list is either a intarray, floatarray, doublearray or list of strings, or a list of compound types.
The typical use can be:
lassign [handle get name1 name2] value1 value2
if -dimensions flag is specified then the sizes of the arrary on each dimension are returned instead the data.