Garage Door Opener Remote Question ?

["Robert11" <rgsros@xxxxxxxxx>]

Hello:

Have lost one of our garage door openers, but do have another one
that wife uses.

Have no idea what brand the opener is; nothing on remote.

Is there a "generic" remote we can buy from somewhere, and somehow transfer
the
code from the one we do have to this new one ?

Or,... ?

Thanks,
Bob