Typing is read as communication and sending messages out. Dream books see frantic typing as pressure to respond, and keys that will not work as frustration at not being understood.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.