FPM URL ,paramter passing

Hi All ,

I have to open FPM URL on button click ,which is fine ,I can achieve it . But I need to open URL with some predefine information e.g PO number .

In order to pass PO number from one FPM application to another ,I am using Export to Database indx(p/) ID 'XX" and import from DB indx and then delete DB indx.

But this solution is not consistent.Export and import does not work properly every time .

Can any one please advice , how can we pass information from one URL to another .

I tried using singleton class as well,but data is cleared up .