Every command and character parameter has at 
least two forms, a short form and a long form. 
In some cases they will be the same. The short 
form is obtained using the following rules. 
A) If the long form has four characters or less, 
the long form and short form are the same.  
B) If the long form has more than 4 characters: 
 (a) If the 4th character is a vowel, the short 
form is the first 3 characters of the long form. 
 For example: 
   comparator  abbreviated to comp 
   current    abbreviated to curr 
   range    abbreviated to rang 
 (b) If the 4th character is not a vowel, the short 
form is the first 4 characters. 
 For example: 
   resistance   abbreviated to res 
   volume    abbreviated to vol 
  If the long form mnemonic is defined as a phrase 
rather than a single word, then the long form 
mnemonic is the first character of the first word(s) 
followed by the entire last word. The above rules, 
when the long form mnemonic is a single word, are 
then applied to the resulting long form mnemonic to 
obtain the short form. 
For example: 
     PercentTolerance abbreviated to ptol