MFTPAgent()
 int  init()
 int  dtuSize_
- the following variables are read/write from within a tcl-script: 
 int  fileSize_
 int  dtusPerBlock_
 int  dtusPerGroup_
 int  seekCount_
 int  off_mftp_
 int  off_cmn_
 unsigned  long  FileSize
- the following variables are not accessible from tcl-scripts: size of file of this transfer 
 unsigned  long  FileDGrams
- number of datagrams in this transfer 
 unsigned  long  dtu_size
- number of data bytes in a DTU 
 unsigned  long  dtus_per_block
- number of DTUs per block 
 unsigned  long  dtus_per_group
- number of DTUs per group 
 unsigned  long  nb_groups
- number of groups the file consists of 
 unsigned  long  nb_blocks()
 unsigned  long  get_dtus_per_group(unsigned long group_nb)