I don't think it can be.
Play with adding a line at the bottom of string.js in your language,
this force users going to forward.
Hi, thx for yr reply.
Could you help me out on how to change this. Pls?
It is somewhere like
C:\Program Files\FileMaker\FileMaker Pro 12 Advanced\Extensions\Web Support\Resources\iwpres\
Pls don't 'play' with production site
No. Been through this myself. Too many variables across systems & software. If you make the whole site SSL (https://) then when they do hit back it goes to a blank screen or "page error" rather than some random previous record, and they quickly get the idea not to use the back btn.