An undivided interest means that the tenant in common has a share in the whole and not ownership of a separate portion.

If the system crashes again, we'll have it fixed in the computer shop.

my house is a shambles empty bottles lined up on table, clothes heaped on chairs, here a sock, there a catshit,

Understand the problem before fixing it. About the only scenario where shotgunning is useful is if there is a shorted IC and you cannot tell which one it is.