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When the stack pointer is moved to a new slot its status, that is to say its number, , , and, in the case of an image, the filename, is displayed. The is a full description of the contents of the slot, for the benefit of the user.
The command RELABEL is used to change the on a list or image. Sensible are generated automatically when a list or image is created by a LEXT command. RETYPE peforms a similar task to change the , although, since these may have semantic meanings to some routines, this command should be used with care.