z/OS MVS Programming: Extended Addressability Guide
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Establishing access

z/OS MVS Programming: Extended Addressability Guide
SA23-1394-00

To connect the entry table to the linkage table in each current and future address space, the service provider issues the ETCON macro. In this case, the service provider can issue the ETCON macro from any address space. 
         LA     2,1
         ST     2,TKCOUNT      SET COUNT OF ETS TO BE CONNECTED
         ETCON  LXLIST=LXL,TKLIST=TKL

All address spaces in the system now have access to the service provider's services. Figure 1shows how the linkage and entry tables appear at this point.

Figure 1. Linkage and entry tables for a global service
Parent topic: Example 2 - Making services available to all address spaces

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