ham_condition_t *ham_condition(ham_entity_t *ehdl, int type,
const char *cname, unsigned flags);
int ham_condition_remove(ham_condition_t *chdl, unsigned flags);
Each entity can be associated with various conditions. And for each of these conditions there's a set of actions that will be performed in sequence when the condition is true. If an entity has multiple conditions that are true simultaneously with different sets of actions associated with each condition, then all the actions are performed for each condition, in sequence.
This mechanism lets you combine actions together into sets and choose to remove/control them as a single “group” instead of as individual items.
Since conditions are associated with entities, an entity handle must be available in order to add conditions. The ham_condition*() functions return an opaque pointer that is a condition handle, which you can use later to either remove a condition or add actions to the condition.