- OBJ_DUDE.msg in the DIALOG folder is where the Tell Me About responses are stored, to be used if the NPC's dialog file doesn't have its own Tell Me About entries, as well as the 'database' of terms for which responses can be generated.
These are "generic" responses used for many (most?) NPCs in each area. The valid terms vary based on area - for example, valid terms when asking Adytum NPCs won't get responses in Junktown and vice-versa, because the towns have different topics of interest. Some do exist cross-location but they are obvious ones such as "Water Chip".
- Some towns have tiers of responses based on "knowledge level" of the NPC(s). So each of these tiers in the same location will give you more or less info than the others, when given the same terms. There's never more than 3 knowledge levels.
- In OBJ_DUDE.msg and all other dialog files, entries 970 to 979 are used for "I am that person"-type responses. The game picks randomly which one to use, each time it needs to use this kind of response.
- In OBJ_DUDE.msg and all other dialog files, entries 980 to 999 are used for "I don't know anything about that"-type responses (used when they have no response entry for a provided word or string), but this isn't documented anywhere that I could find. The game picks randomly which one to use, each time it needs to use this kind of response.


- As with the section above, Fallout only shipped with entries 980/981/982 used, meaning that the system generates errors because it looks for all twenty entries. This is the cause of some Tell Me About issues.
- In each NPC's dialog file, entries 1000 to 1099 are used as the 'database' of valid query terms. Each entry contains a word or string (spaces and punctuation are allowed). As with above, Fallout checks for all 100 entries, so if some don't exist, it generates errors.
- All entries discussed in the post so far are not parsed for each NPC until the first time you send an input via the Tell Me About prompt. (By typing anything and then clicking DONE or hitting Enter.)
- In each NPC's dialog file, entries 1100 to 1199 are used for the corresponding responses to each query term. If player submits query matching entry 1000, NPC responds with entry 1100, query entry 1001 with entry 1101, and so on. Interestingly, unlike the other tables, Fallout doesn't check if these entries exist up to 1199, so no dummy entries are needed if wanting to avoid errors.
- Scrolling in the dialog window doesn't work while using Tell Me About, meaning the rollover text on long entries cannot be read, ever.
- Tell Me About entries and responses do not show up in the Review function. (Button at bottom-left of Dialog interface)
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