If the mnemonic is not found in the terminal definition table or the key definition table, the initialization routine determines if the mnemonic is a key label mnemonic. This is determined by determining if the mnemonic starts with "L_". If it does, the key definition table is searched for the remainder of the mnemonic. If found, the string specified for the field is placed in the key label member of the KEYDEF structure associated with the mnemonic. This key label is used by key_getlabel().
