.DATASET SET CURRENT 
This subroutine sets the "current" Dataset to be a previously initialized Dataset.
  Usage: 
      PASS         <dataset_name>             FIELD            SHARE? N
      GOSUB    0CD .DATASET SET CURRENT
      *        Check for error
      IF       0CD .DATASET SET CURRENT       NE
  Description: 
This subroutine sets the "current" Dataset to be a previously initialized Dataset. You must have initialized the dataset via 
.DATASET INITIALIZE before selecting it as the "current" dataset. 
<dataset_name> must be PASSed, otherwise the subroutine will cancel. You can PASS a blank name to refer to the "unnamed" dataset.
The specified dataset become the "current" dataset.
See 
Datasets Overview for more information on working with data.
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-- 
JeanNeron - 2011-11-11