This command can be used to check the amount of available storage in the TSO region.

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Sample output from the SHOWFREE command follows:

Largest Contiguous Virtual Storage Block Available:
  Above the Line. . :   12.30 MB
  Below the Line. . :    3.66 MB
Total Virtual Storage Available:
  Above the Line. . :   24.86 MB
  Below the Line. . :    3.70 MB