Apache Ant

Sorry, no Know How, just questions:

• What does -Dforce=yes do? Never found any trace of documentation on this. Does it do what I think it does: Redo all targets and ignore file times? (That is exactly what I need 99.9999% by default, because usually the file times are completely messed up in common situations, so you need to ignore the file time and just rebuild everything. I even saw machines which have the time going backwards - while building - and these still need to get a complete and successful build of dependencies.)
• Is there a single gomplete manual of Ant, somewhere? No, the original documentation of Apache Ant is broken. Broken up in many files. In contrast I want a single file. Even if it's 1 TiB big. Single, like me, see?