XkbLatchGroup - Man Page

Bool XkbLatchGroup (Display *display, unsigned int device_spec, unsigned int group);

display

connection to the X server

device_spec

device ID, or XkbUseCoreKbd

group

index of the keysym group to latch

XkbLatchGroup sends a request to the server to latch the specified group and  does not wait for a reply. It returns True if the request was sent and False  otherwise.

Reference the keysym group indices with these symbolic constants:

True

The XkbLatchGroup function returns True if a request was sent to the server to latch the specified group.

False

The XkbLatchGroup function returns False if the request was not sent.