Minor changes are by default collapsed in the page history.
No changes
The page does not exist yet.
Failed to load changes
Version by on
Leave Collaboration
Are you sure you want to leave the realtime collaboration and continue editing alone? The changes you save while editing alone will lead to merge conflicts with the changes auto-saved by the realtime editing session.
Virtual Terminal Global Area (VCD) control block
The virtual terminal global area (VCD) is normally the first CSECT in module VTFXVCDn. It stores constants, variables, and addresses used by all virtual terminal routines resident in the IMS control region. The load module containing the VCD is loaded by VTFXINTn during control region initialization and remains there until IMS shutdown.
