SequenceHold is an attribute which specifies that Sequence objects appearing in the arguments of a function should not automatically be flattened out.
The attribute HoldAllComplete prevents Sequence objects from being flattened out.
See The Mathematica Book: Section 2.5.3 and Section 2.5.5.
See also: HoldAll, HoldAllComplete.
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER
FOR THE LATEST INFORMATION.