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NAME
     tt_thread_session_set - set the default  session  identifier
     for the currently active thread

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_thread_session_set ( const char *sessid );

DESCRIPTION
     The tt_thread_session_set() function sets the  default  ses-
     sion identifier for the currently active thread.

     The ToolTalk service uses the initial user  session  as  the
     default   session   and supports one session per procid. The
     application can make this call before it calls tt_open(3) to
     specify  the  session  to  which  it wants to connect in the
     active thread.

     The sessid argument is a pointer to  the  unique  identifier
     for the session in which the procid is interested.

RETURN VALUE
     Upon  successful  completion,  the   tt_thread_session_set()
     function  returns  the status of the operation as one of the
     following Tt_status values:

     TT_OK The operation completed successfully.

     TT_WRN_NOT_ENABLED
             The feature has not yet been enabled.

     TT_ERR_NOMP
             The ttsession(1) process  is  not  running  and  the
             ToolTalk service cannot restart it.

     TT_ERR_PROCID
             The current default process  identifier  is  out  of
             date or invalid.

     TT_ERR_SESSION
             The specified ToolTalk session is  out  of  date  or
             invalid.

APPLICATION USAGE
     To change to another opened session,  the  application  must
     use      either      tt_thread_procid_set(3)      or     .BR
     tt_default_procid_set (3).

     To join other sessions, the procid must first  set  the  new
     session  as   the   default session, and then initialize and
     register with the ToolTalk service.  The calls required must
     be in the following order:
     tt_thread_session_set()     or     tt_default_session_set(3)
             tt_open(3)
     The tt_open(3) may create another ToolTalk procid, the  con-
     nection   to which is identified by a procid. Only one Tool-
     Talk session per procid is allowed.  (However, multiple pro-
     cids  are  allowed  in a client.)  There are no API calls to
     determine to which session a particular procid is connected.
     If  it  is important for the application to know the session
     to which it is connected. It must make the  following  calls
     in the indicated order:
     tt_open(3) tt_thread_session(3)
     The application can then store the information  by  indexing
     it by the procid returned by the tt_open(3) call.
SEE ALSO
     tt_c(5), tt_open(3), tt_default_procid(3),
     tt_thread_procid(3), tt_default_session(3),
     tt_thread_session(3).

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