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- /UCMD - Assigns a user-defined command name.
 - /UDOC - Determines position and content for the multi-legend options.
 - /UI - Activates specified GUI dialog boxes.
 - UIMP - Defines constant material properties (GUI).
 - /UIS - Controls the GUI behavior.
 - /UPF - Links a user-programmable routine into Mechanical APDL.
 - *ULIB - Identifies a macro library file.
 - UNDELETE - Removes results sets from the group of sets selected for editing.
 - UNDO - Enables the user to modify or save commands issued since the last RESUME or SAVE.
 - /UNITS - Annotates the database with the system of units used.
 - UNPAUSE - Restores use of a temporarily released product license.
 - UPCOORD - Modifies the coordinates of the active set of nodes, based on the current displacements.
 - UPGEOM - Adds displacements from a previous analysis and updates the geometry to the deformed configuration.
 - *USE - Executes a macro file.
 - /USER - Conveniently resets /FOCUS and /DIST to USER.
 - USRCAL - Allows user-solution subroutines to be activated or deactivated.
 - USRDOF - Specifies the degrees of freedom for the user-defined element USER300.
 - USRELEM - Specifies the characteristics of the user-defined element USER300.