Hit delete key. Files will be moved to the recycle bin. To Undo, hit Ctrl+Z or via view/output window menu command (read more: undoing operations).

Deleting.

Hit Shift+Delete. They will not be moved to the recycle bin, but really deleted, undoing is impossible. To remove to the recycle bin, press Delete.

Destroying

Select file | special | destroy menu command. The selected items (also files in subfolders if any) will be destroyed so it will be impossible to recover them.

Remarks

Simply recycling (keyboard: delete) files of course does not guarantee that the files are deleted forever - they can be found in the recycle bin and recovered. But, what's more, even deleted (keyboard: shift+delete) files may be recovered using an appropriate software.

So: destroying. This is done by writing values (zeros or random values) to the files which are to be destroyed, and then - deleting. In Ac Browser Plus, there are 3 levels of destruction.

Using level 1 is recommended, because files destroyed in this way will not be recovered using any standard undelete-software.

But, if you want to prevent your data from being recovered by more sophisticated, laboratory methods (like Magnetic Force Microscopy - MFM and possibly many others), then you should rather use level 2 or 3. More about this issue (e.g. why and how the data can be recovered from magnetic media) you can find here: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html (Peter Gutmann's article).

Here is a brief description of those levels used in ACB:

Level 1:

Every file will be overwritten once with zeros, once with random values, and once again with zeros. It's really enough in most cases - really, it's impossible to recover the files with any standard software. And, this is the fastest method.

Level 2:

As above, but overwriting with random values will be repeated 6 times.

Level 3:

Full Gutmann's method - sequence of 35 consecutive writes to every file. It's a very long process, but you have 100% guarantees that no one will ever be able to recover data.

More about Gutmann's method: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html

Note however, that even if a file is overwritten hundreds of times, it gives you nothing, if there is a backup copy of this file, made either by you, or by a special auto-backup software. For example, Windows NT and ME systems are equipped with so named System Restore - it however takes care about "system" files only, so, if you are destroying documents (of any program), then don't be concerned about it.

Destroying doesn't work for FTP files/folders.

Recycling.

Deleting.

Destroying