Page of GC20-1807-7 As Updated April 1, 1981 by TNL GN25-0829
The user doubleword can be used for control information in a
user-defined higher level protocol. That is, you could have your own
message headers defined within the data transmitted from one virtual
machine to another. The user doubleword could be used to control such a I-'.L. V\..V\...VJ.. Part 2. Control Proqram (CP) 166. 1
April 1, 1981
166.2 IBM VM/370 System Programmer's Guide
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