OPEN LINK command: Difference between revisions
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==Syntax== | ==Syntax== | ||
<p class="syntax"><b>O</b>PEN LINK < | <p class="syntax"><b>O</b>PEN LINK <var class="term">linkname</var> REPLACE <var class="term">oldlinkname</var> | ||
</p> | </p> | ||
<b>Where:</b> | <b>Where:</b> | ||
linkname is the link specified on the DEFINE LINK command. | <var class="term">linkname</var> is the link specified on the DEFINE LINK command. | ||
<p>oldlinkname is a Horizon VTAM link that was abandoned using the CLOSE LINK command with the ABANDON keyword.</p> | <p><var class="term">oldlinkname</var> is a Horizon VTAM link that was abandoned using the CLOSE LINK command with the ABANDON keyword.</p> | ||
==Usage notes== | ==Usage notes== | ||
<p>Depending on the TRANSPORT option of the DEFINE LINK command, the OPEN LINK command opens the CRAM channel or terminal connection. The OPEN LINK command also opens the SNA Communications Server ACB, the access method control block that SNA Communications Server uses to gather all information about the application program, which in this case is <var class="product">Model 204</var>.</p> | <p>Depending on the TRANSPORT option of the DEFINE LINK command, the OPEN LINK command opens the CRAM channel or terminal connection. The OPEN LINK command also opens the SNA Communications Server ACB, the access method control block that SNA Communications Server uses to gather all information about the application program, which in this case is <var class="product">Model 204</var>.</p> | ||
Revision as of 18:43, 27 June 2013
Summary
- Privileges
- User 0, system administrator, system manager
- Function
- The OPEN LINK command enables the link specified on the DEFINE LINK command.
Syntax
OPEN LINK linkname REPLACE oldlinkname
Where: linkname is the link specified on the DEFINE LINK command.
oldlinkname is a Horizon VTAM link that was abandoned using the CLOSE LINK command with the ABANDON keyword.
Usage notes
Depending on the TRANSPORT option of the DEFINE LINK command, the OPEN LINK command opens the CRAM channel or terminal connection. The OPEN LINK command also opens the SNA Communications Server ACB, the access method control block that SNA Communications Server uses to gather all information about the application program, which in this case is Model 204.
All system-wide control blocks and buffers necessary for activating sessions are allocated during open processing.
If the DEFINE LINK command specifies the PSWD parameter, the user is prompted for a password.
OPEN LINK must be issued before any TPROCESS, Transfer Control, or Horizon User Language statements are issued or before a Connect:connection is established.
Replacing an abandoned Horizon VTAM link
When a Horizon VTAM link has been abandoned, using the ABANDON keyword of the CLOSE LINK command, it is sometimes possible to open a new Horizon VTAM link to replace the abandoned link and to take over its associated REMOTE, SESSIONGROUP and PROCESSGROUP definitions, using the REPLACE keyword in an OPEN LINK command.
OPEN LINK newlink REPLACE oldlink
This is possible if the CLOSE LINK linkname ABANDON command left the old link in an abandoned state.
If, however, the CLOSE LINK command completed in such a way that the link can be re-opened, the following new message is produced:
M204.2890: LINK linkname CLOSED NORMALLY. IT CAN BE RE-OPENED
In this case the keyword REPLACE of the OPEN LINK command cannot be used to replace the link. Instead the link should be re-opened as normal.