LU 6.2 API intrinsics contain optional parameters
that may or may not be passed on any given call. Whenever intrinsics
that take optional parameters are used, a communication mechanism
must exist between the calling program and the intrinsic to indicate
which parameters are being passed and which have been omitted. In
many languages, this communication mechanism is handled by the compiler.
TPs written in the Transact language running on MPE V must provide
this communication mechanism by including a parameter
mask in each intrinsic call that specifies which parameters
are being passed and which are being omitted.
