A resource identification number (RIN) identifies a user-defined resource. A RIN allows a user to exclusively access resources including I/O devices, disk files, and programs.
The DRIN command (abbreviated DR) removes allocated 
global resource identification numbers.  DRIN has the 
following parameter:
   DRIN (DR)     [GLOBAL     =] global-rin number
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To delete a global RIN or a range of global RINs, enter DRIN and the RIN at the MISC configurator prompt:
   misc>DRIN 4             ** Deletes single RIN ** 
   misc>DRIN (1,2,3,4,15,84)  ** Deletes group of RINs ** 
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The changes made using the DRIN command take effect only if a tape containing the changes is generated and the newly created tape is used to update the configuration or install the system.