how is this browse function working ?

firstly you can make object if you need to get data from other module

model_obj= self.pool.get('your model')

secondly if you know the id you can directly call browse record:

record= model_obj.browse(cr, uid, your id, context=context)

then record. any field.

if you can not know the id you can make search :

rec_ids= model_obj.search(cr, uid, [('your field','comparison',value)], context=context)

this mean [('your field','comparison',value)] your domain

for record in model_obj.browse(cr, uid, rec_ids, context=contect)

record. any fields

I hope i helped you...