ClearRexxMsg(msgptr,count)(a0,d0)       - Releases and clears the argument
                                          array in a RexxMsg
CreateArgstring(string,length)(a0,d0)   - Create an argument string
                                          structure
CreateRexxMsg(port,extension,host)(a0/a1,d0)
                                        - Create an ARexx message
                                          structure
DeleteArgstring(argstring)(a0)          - Releases an Argstring created by
                                          CreateArgstring()
DeleteRexxMsg(packet)(a0)               - Releases a RexxMsg structure
                                          created by CreateRexxMsg()
FillRexxMsg(msgptr,count,mask)(a0,d0/d1)- Fill the argument strings as
                                          needed
IsRexxMsg(msgptr)(a0)                   - Function to determine if a
                                          message came from ARexx
LengthArgstring(argstring)(a0)          - Returns the length value stored
                                          in the argstring
LockRexxBase(resource)(d0)              - Obtain a semaphore lock on the
                                          RexxBase structure
UnlockRexxBase(resource)(d0)            - Release a semaphore lock on the
                                          RexxBase structure

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