15. The document processing means of claim 11, wherein said supervisory control means further comprises: stack means for storing information identifying state of execution of said document operation and supervisory operation routines, said processor means being responsive to execution of said routines for writing said information identifying state of execution of said routines into said stack means and reading said information identifying state of execution of said routines from said stack means.
15. The document processing means of claim 11, wherein said supervisory control means further comprises: stack means for storing information identifying state of execution of said document operation and supervisory operation routines, said processor means being responsive to execution of said routines for writing said information identifying state of execution of said routines into said stack means and reading said information identifying state of execution of said routines from said stack means. 16. The document processing means of claim 15, wherein said stack means further comprises: supervisory control stack means for storing type of routine information and vectors of current and interrupted said document operation routines, and document operation stack means for storing certain of interrupted document operation routines.