NAME
     tt_open - return the process identifier for the calling pro-
     cess
SYNOPSIS
     #include <Tt/tt_c.h>
     char *tt_open(void);
DESCRIPTION
     The tt_open() function returns the  process  identifier  for
     the calling process.
RETURN VALUE
     The tt_open() function also  sets  this  identifier  as  the
     default  procid for the process.  The tt_open(3) function is
     typically the first ToolTalk function called by a process.
     The application must call tt_open(3) before other tt_  calls
     are    made.    However,   there   are   three   exceptions:
     tt_default_session_set(3),    tt_feature_required(3),    and
     tt_X_session(3) can be called before tt_open().
     A process can call tt_open() more than once to obtain multi-
     ple procids.  To open another session, the process must make
     the following calls in the order specified:
          tt_default_session_set(3)
          tt_open()
RETURN VALUE
     Upon successful completion, the tt_open()  function  returns
     the  character  value  that uniquely identifies the process.
     The application can use tt_ptr_error(3) to  extract  one  of
     the following Tt_status values from the returned pointer:
        TT_OK   The operation completed successfully.
        TT_ERR_NOMP
                The ttsession(1) process is not running  and  the
                ToolTalk service cannot restart it.
APPLICATION USAGE
     The application should  use  tt_free(3)  to  free  any  data
     stored in the address returned by the ToolTalk API.
     Each procid has its own associated file descriptor, and  can
     join  another  session.   To  switch  to another procid, the
     application should call tt_default_procid_set().
SEE ALSO
     tt_c(5), tt_fd(3), tt_default_procid(3),
     tt_default_procid_set(3), tt_default_session(3),
     tt_default_session_set(3), tt_feature_required(3),
     tt_ptr_error(3), tt_free(3).
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