You can specify certain words or abbreviations having a special definition in a card; these words are called “labels” and are identical to grammar labels used in Lingvo dictionaries. When you position the mouse pointer on such a label a question mark appears. Press the left button to display a small window alike a tooltip window showing the definition of the label. For example, v. - verb.

The list of already implemented labels used in our system dictionaries is a DSL-dictionary -  abbrev.dsl which you can find in root Lingvo folder. 

1. Select the label in the card body using [p] tag. The respective switch-off tag is [/p]. The example has v. label displayed in italics and in a special colour:
   [c][i][p]v.[/p][/i][/c]
   Note: Items 2-4 are required if the label you’ve entered is not already in abbrev.dsl dictionary.
2. Enter the necessary changes to abbrev.dsl file (New label is an card heading in a abbrev.dsl dictionary. The card body should contain the text defining the label; this text will be shown when you click that particular label in the card).
3. Compile abbrev.dsl with DSL-compiler.
4. Put the dictionary compiled to Lingvo folder abbrev.lsd.