| ISGTRC(CTR) | A function that returns the  
  transformation function number when a name or abbreviation is given. | 
 
| SGTRQF(NTX,LTR) | Checks whether a transformation   
  function number (NTX) is defined. When defined, it returns the value  .TRUE.   
  for   LTR, when not defined, .FALSE.. | 
 
| SGTRSL(CTS,CTL) | Returns the name when given the abbreviation. | 
 
| SGTRSN(CTS,NTX) | Returns the transformation function number when  
  given the abbreviation. | 
 
| SGTRLS(CTL,CTS) | Returns the abbreviation when given the name. | 
 
| SGTRLN(CTL,NTX) | Returns the transformation function number when  
  given the name. | 
 
| SGTRNS(NTX,CTS) | Returns the abbreviation when given the  
  transformation function number. | 
 
| SGTRNL(NTX,CTL) | Returns the name when given the  
  transformation function number. |