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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Having a chat, maybe 6 letters:

ONLINE: Having a chat, maybe
LOGIN: Prepare to chat, maybe
LOGON: Prepare to chat, maybe
FACETIMED: Video-chatted, maybe
REMINISCES: Chats at a high-school reunion, maybe