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Special Features and Customization Tasks › Customize the APTPX Member › Application Definition Parameters

Application Definition Parameters

The following list explains the parameters on the application definition statements in the previous example.

PARSESS

Specifies whether users can share this virtual terminal. You must include this parameter in the statement defining a virtual terminal. To allow users to share the virtual terminal for applications allowing parallel sessions, specify YES.

SRBEXIT (z/OS only)

Determines whether the product uses the VTAM authorized path facility (also called "fast path"). You must include this parameter on each statement in the APTPX member. Initially, the SRBEXIT parameter in each statement is set to NO for ease of installation.

To use the authorized path facility

  1. Change the value of each SRBEXIT parameter to YES.
  2. Put the load modules in an APF-authorized library, as described in the Installation Guide.
  3. Enter a Y in the VTAM Authorized Path Facility field of the performance parameters panel on the System Options Table (SMRT).
MODETAB

Identifies the logon mode table containing the required session parameters for communication between CA TPX and the application. You can specify the TPXLGMOD table (found in member TPXLGMOD of the TPX.CB0VSRC data set) for communication with most applications. For applications requiring special logon mode tables, see Customizing Logon Mode Tables.

DLOGMOD

Assigns certain device characteristics to the virtual terminal. VTAM typically uses the value in this parameter as the default logon mode table entry name if one is not supplied. This product, however, always supplies a logmode entry that best fits the physical terminal characteristics.

The product uses this parameter when selecting a virtual terminal for applications that have Y specified in either the Model Sensitive or Extended Datastream field in the ACT. (For more information, see Customize Logon Mode Tables.)

Position 7 of this parameter value designates a model number. A letter "E" in position 8 indicates that the terminal is queriable. The following definition gives the virtual terminal the device characteristics of a 3278 model 2 terminal that is not queriable:

TPXGR001 APPL MODETAB=TPXLGMOD,DLOGMOD=T3278M2,

The following definition gives the virtual terminal the device characteristics of a 3278 model 5 terminal that is queriable:

TPXGR002 APPL MODETAB=TPXLGMOD,DLOGMOD=T3278M5E,

The only applications for which this product actually uses the DLOGMOD information are those having a Y in either the Model Sensitive or Extended Datastream field on the ACT.

EAS

Gives an estimated number of active sessions for each virtual terminal. Specifying an over-estimated value for the EAS parameter will cause VTAM to waste common storage. Typically, you should specify EAS=1 to start.

VTAM uses this value to build a look-up table for sessions associated with this virtual terminal. For information on what values will provide you with larger look-up tables, see the appropriate IBM documentation.

SESSLIM

SESSLIM=YES is required for a unique ACB if the virtual terminal is passed more than once to an application; for example, IBM-Net, TCP-IP/IBM-Host.