SNAX/XF LU Network Services Manual

LUNS Configuration Tables
Introduction to LUNS
1–10 097841 Tandem Computers Incorporated
Figure 1-5. The ESS Table and LUNS Processing (Non-Pathway)
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TACL, PLUNAME #TACL, CONCDATA "TACL CPU1/2"
The terminal operator enters the character-coded command TACL.
LUNS searches the ESS table for a record named TACL and finds it. LUNS also
finds the application's logical name (#TACL) and a concatenated data field specifying
NEWPROCESS parameters.
LUNS knows from its internal control blocks that #TACL has been associated with the
Creator process through a SCF ADD APPL command. In the same way, it knows the
name of the object file where #TACL can be found. LUNS therefore sends the
Creator process a CINIT request with the concatenated data, along with the name of
the object file.
The Creator creates the TACL and informs it of the logon.
The TACL opens the terminal.
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Terminal
Creator
Process
TACL
LUNS
OPEN LU NEWPROCESS
TACL CINIT
ESS Table
Figure 1-6 shows how LUNS uses an ESS table to process a logon request for a
Pathway application whose character-coded logon is CRED.