Updated July 2015
? tab(-10, AG_RELEASEKBD); opcode; chr(127);
AG_RELEASEKBD (49) releases the ATE "keyboard hold" so that it can be used as a dumb terminal again—i.e. so that keyboard characters are transmitted immediately to the server.
The opcode parameter is optional and is normally omitted, in which case the keyboard hold is released, provided it hasn't been locked (via AG_HOLDKBD opcode 2). This command is normally used only internally by A-Shell, as part of the ATE command protocol, although it may be used in situations where the ATE command protocol would normally leave the keyboard in local hold mode but you need to temporarily revert to dumb terminal mode.
In order to remove the locked hold, you must specify opcode "2", e.g. ? tab(-10,AG_RELEASEKBD);"2";chr(127);
See the discussion under Set ATE Keyboard Hold for information on opcode 4.
History
2015 January, A-Shell 6.1.1399: Add opcode 4.