The commands are activated by menu VECTOR->QAD or toolbar or command line. The commands and their options can be specified in English by prefixing the character "_" to the name (e.g. _ LINE) regardless of the language used in QGIS.
QAD command can be
interrupted at any moment by the activation of another tool. To
resume the paused command and make active the QAD environment use
the QAD item in the QAD menu or press the button in the
toolbar.
As you type the name of a command QAD will display a list of commands that begin with what has been written Typing "*" the list of all QAD commands will appear.
To choose an option, type the capital letters for this option or click on the option that you want.