Define a corpus:

create a selection of texts to query.

Search by lemmas:

investigate the corpus lemmas in alphabetic order or with a filter.

Search the forms:

investigate the corpus forms in alphabetic order or with a filter.

Word's attestations:

browse the texts by words and their labels.

Search for collocations:

browse the texts by words appearing in two-word collocations.

Les lemmes utilisés pour le DÉCT sont les lemmes du Tobbler-Lommatz. Ex. pour voir (moderne) chercher vëoir.