BDicty - a shell program for dictionary with file name is BDicty.prc. If you need help on how to install any software files to your Palm, please read this.
Every lexicon allows translation from one direction to another.
The direction is usually indicated by the lexicon title, e.g. En2Ger. To translate bi-directionally you need a pair of lexicons. For example to Translate from English to German you need En2Ger.pdb and Ger2En.pdb. BDicty supports unlimited number of lexicons. It all depends on the available memory.