<desc>Player whose hostility towards another player you want to change.</desc>
</param>
<param>
<type>int</type>
<name>player2</name>
<desc>Player towards whom you want to change hostility.</desc>
</param>
<param>
<type>bool</type>
<name>hostile</name>
<desc>If unequal to 0, the relationship is hostile. Else friendly.</desc>
</param>
<param>
<type>bool</type>
<name>silent</name>
<desc>If not 0, the hostility messages in the message board will be suppressed. Hostility messages are never displayed during the first frame of a round, regardless of the value of this parameter.</desc>
</param>
<param>
<type>bool</type>
<name>no_calls</name>
<desc>If not 0, the callbacks RejectHostilityChange and OnHostilityChange are not executed. From CR.</desc>
</param>
</params>
</syntax>
<desc>Sets bilateral friendship of two players.</desc>