Start xcv with two images. If the image file names are basement00.mit and basement01.mit for example then start xcv by typing:
xcv basement00.mit basement01.mit
To compute F or H matrices we will first need to load or compute corners in both images.
Note that if you start xcv with more than two images loaded then when performing a two view relation you will be asked to select which two images the operation is to be performed on. Do this by clicking the left mouse button once on each required image.