yes! there is!
To link or merge two verts together:
select two or more verts. (i usually go 2 at a time, it is slower, but it's cleaner, you'll see why)
in the edit menu, highlight the sub-menu for vertices. it'll open various option.
find the option labeled "merge" and click on it. careful not to move the mouse very far.
You will get a pop-open menu with some options.
at first
at last
at center
at cursor
collapse
Stay away form "collapse"! it will take all your verts and condense them to one point, basically destroying your mesh!
at first will merge the vertices at the position of the vert you selected first.
at last will merge the vertices at the position of the vert you selected last.
at center will merge both vertices to the area directly between the two.
at cursor will drag the now merged verts to your cursor location (the cursor being the little red circle)
the hot-key for merge is :: alt + m (hit atl and m at the same time)