oncommand
adverbUK /ˌɒn kəˈmɑːnd/
US /ˌɑːn kəˈmænd/
When something happens on command, it happens right away when someone tells it to.
The well-trained dog sat down on command.
OTHER MEANINGS
2. Able to be started or controlled whenever a person wants, especially of a computer feature.
The app can take a photo on command.
3. Following orders without hesitation.
The soldiers moved on command.
4. Available to be used or shown whenever needed.
The singer performed her famous song on command.