I am not positive what you are asking here, but if I understand correctly, when someone is on 'form 2' you want to show the second record, 'form 3' the third, etc...
I'm not sure how practical it is (since I do not know how many records the file holds) but you could read the file into an array and show the appropriate record by the indicies of the array. If you have fixed length records you could use seek(), etc... to read a certain amount of bytes from a certain place in the file to only read in the record you want. I find this hard to answer without knowing the type of records, the number of records, and if these records are static (as well as if there will often be new records). Why not use a database (out of curiosity)?

Cheers,
KM