STACK

APPEND

 If the \APPEND qualifier is used, then subsequent commands will be
 appended to the stack file.

 The default, \NOAPPEND, is to open a new file.

NOEXECUTE

 If the \NOEXECUTE qualifier is used, then subsequently entered commands
 will be written to the file, but will NOT be executed.

 The default, \EXECUTE, is to execute commands normally.