The question has two operative parts:
1. Applying through proper channel.
If the current and prospective(new) employer are gvernment/public sector it is either explicit or implicit that the applicant should forward the new application through 'proper channel' or furnish an NOC from the current employer. Generally the announcement or prospectus say clearly that the application should be forwarded through proper channel. If so it is compulsory thatthe application should be submitted through proper channel.
Proper channel means through the current employer. When the appication for new job is forwarded through proper channel, then if seelcted the employee can demandrelief and will not be subjected to any disciplinary action for not informing about new job. However sometimes the current employermay write some comments on the forwarded application likeif the person is under some service bond or financial bond etc. Proper channel also takes some time amd may have to pass through various layers of authority also. Usually an employer does not create any objectons and forward the application as such and imply that the employee has to resign as per laid down procedure. However sometimes the current employermay write some comments on the forwarded application likeif the person is under some service bond or financial bond etc.
2. Indemnity Bond
Indemnity bond is a written document with prescribed fees stamp(sometimes notarised also) which says that the signatory will'indemnify' or compensate for any loss arising out of his actions violating the contract conditions. The compensation may be finacila like say the salary for remainig periods of contract, amount plus interest plus traiing charges etc. That is puresl as per the bond clauses. So when a contract is violated,thenthe signatory has to satisfy the bond clause. Then only the employe will get the properrelief and no-due,no-liabilit and NOC ;etter.
Indemnity bond can be generally transferred only if the beneficiary is same inthe current and new situations., and the service conditions and bond clauses in the new job also is same. In that case the servic in the earlier job should be taken into consideration in the nee employment. This is very rare. Otherwise(and generally)the earlier bond has to be satisfied and a new bond,if necessary, with new employer signed afresh.