Once HomeSite integration is enabled, you can use TopStyle to edit style sheets from within HomeSite. Simply right-click on a CSS file in HomeSite's file list and select "Edit Style Sheet," and the style sheet will be opened for editing in TopStyle. In addition, right-clicking on a <link> tag in HomeSite and selecting "Edit Linked Style Sheet" will open the style sheet in TopStyle. If TopStyle Pro is installed, it will be used whenever editing CSS files from within HomeSite. Otherwise, TopStyle Lite will be used.
Note: Due to a bug in HomeSite 4.01, you cannot edit linked style sheets that use relative paths. Attempting to do so will cause HomeSite to display a "file not found" message. This problem does not exist in later versions of HomeSite.