Thanks for the Tutorial,

1 more question, say im in flight and in the FMC I select rwy for landing then ATC pops on and says no land on this rwy. Now after I go into my legs page and make the nessecary descent changes and I change the rwy and hit execute. It won't follow my vnav profile. Now there is no discon in the FMC so wy would'nt my AC follow the profile I am telling it to ? I started my descenct ,changed my FL and hit FL button it would just descend , no restriction to the ALT i have in the CP. Thanks for any help