RFCEXEC

You can see it in SM59 -> TCP/IP Connection -> SERVER_EXEC -> System Information -> Function list.

RFC_RAISE_ERROR !!! FOR INTERNAL USE ONLY !!!

RFC_REMOTE_EXEC allows to start programs and to pipe an internal table into
 stdin without waiting for the program to end.

 IMPORTING
   COMMAND        C(256)
     program name.
 TABLES
   PIPEDATA       C(80)
     internal table serves as input to the started program.

RFC_REMOTE_FILE allows to read or write text files.

 IMPORTING
   FILE           C(256)
     file name
   WRITE          C(1)                 (Default SPACE)
     if WRITE is 'X' the internal table is written to the file,
     else it is filled from the file.
 TABLES
   FILEDATA       C(80)
     internal table serves as input to the file, if WRITE is 'X'
     else it is filled from the file.

RFC_REMOTE_PIPE allows to start programs and to pipe an internal table into
 stdin. The caller waits until the program ends.

 IMPORTING
   COMMAND        C(256)
     program name
   READ           C(1)                 (Default SPACE)
     if READ is 'X' the internal table is filled from stdout
     instead of being piped into stdin.
 TABLES
   PIPEDATA       C(80)
     internal table serves as input to the started program, if
     READ is 'X' it is filled by the started program instead.
   
Example
 CALL FUNCTION 'RFC_REMOTE_PIPE'
   DESTINATION i_dest
   EXPORTING
     command               = l_command
     read                  = 'X'
   TABLES
     pipedata              = t_flist
   EXCEPTIONS
      system_failure        = 1  MESSAGE errmsg
      communication_failure = 2  MESSAGE errmsg.
   IF sy-subrc NE 0.
     IF sy-subrc = 1.
       MESSAGE errmsg TYPE 'I' RAISING system_failure.
     ELSE.
       MESSAGE errmsg TYPE 'I' RAISING rfc_connection.
     ENDIF.
     EXIT.
   ENDIF.
   
RFC_MAIL
 allows to send mail via e-mail (example only).

 IMPORTING
   USER           C(256)
     user name (e-mail address).
 TABLES
   MAIL           C(80)
     internal table containing mail.

RFC_START_PROGRAM allows to start programs without waiting for the program to end
  Only available via explizit call of RfcAllowStartProgram

 IMPORTING
   COMMAND        C(512)
     program name.

 EXPORTING
   ERROR          C(255)
     Error text.

RFC_SET_REG_SERVER_PROPERTY Set different properties for an registered server

 IMPORTING
   EXCLUSIV(1): 'Y': Start exclusiv use of this reg. server
                'N': Stop  exclusiv use of this reg. server
                'E': Disconnect

API_CREATE_TID creates a transaction-ID for transactional RFC
 ONLY FOR tRFC BETWEEN EXTERNAL PROGRAMS

 EXPORTING
   TID(24)

RFC_START_GUI starts SAPGUI on FrontEnd system for working
 with Function Module needed Input/Output on SAPGUI

 IMPORTING
   STGUICMD(255)

API_CLEAR_TID calls function noted by RfcGetTransID()
 INTERNAL USE: CONFIRMATION OF EXECUTED LUW

 IMPORTING
   CALLID(64)

ARFC_DEST_CONFIRM calls function noted by RfcGetTransID()
 INTERNAL USE: CONFIRMATION OF EXECUTED LUW

 IMPORTING
   CALLID(64)

ARFC_DEST_SHIP
 INTERNAL USE: PLAYBACK OF RECORDED RFC DATA
 TABLES
    DATA LIKE ARFCSDATA
   STATE LIKE ARFCSSTATE

RFC_DOCU returns this text.

 TABLES
   DOCU           C(80)
     contains documentation text.

RFC_PING2 connection test.
 #+ load test

RFC_PING connection test.

RFC_SYSTEM_INFO gives some informations about the execution environment.

 EXPORTING
   RFCSI_EXPORT   LIKE RFCSI