TDLightTelegramBots/TelegramBots.wiki/abilities/Advanced.md

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# Advanced
This will be more of a FAQ on some important notes before you embark on your next big bot project!
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## Default Abilities
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It is possible to declare "DEFAULT" abilities that process non-command messages. This is quite close to a reply. If a user says "Hey there" and the default ability is implemented, it will process this input.
```java
/**
* This ability has an extra "flag". It needs a photo to activate! This feature is activated by default if there is no /command given.
*/
public Ability sayNiceToPhoto() {
return Ability.builder()
.name(DEFAULT) // DEFAULT ability is executed if user did not specify a command -> Bot needs to have access to messages (check FatherBot)
.flag(PHOTO)
.privacy(PUBLIC)
.locality(ALL)
.input(0)
.action(ctx -> silent.send("Daaaaang, what a nice photo!", ctx.chatId()))
.build();
}
```
This ability will send a *"Daaaaang, what a nice photo!"* whenever the bot receives a photo. This is one use case where replies and abilities are interchangeable.
## The Global Flag
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There is a global flag in AbilityBot that restricts the kind of "updates" it can process. The default implementation is passthrough - it allows all updates to be processed.
As an example, if you want to restrict the updates to photos only, then you may do:
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```java
@Override
public boolean checkGlobalFlags(Update update) {
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return Flag.PHOTO;
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}
```