workflow

hello every body,

I am new to workflow i have done the practicals, but i got a problem in real time..

Could you please tell me how to develop a workflow to trigger whenever a basic salary of employee changes. The workflow sends a notification to the manager for approval.

The manager can either approve it or reject. and how to develop a workflow that triggers automatically when an employee gets a promotion. A work item should be sent to all the employees in the company.

it would be greatful we u can provide me with workflow transaction codes also.

thanks in advance

madhu.