Thanks nerf, that's perfect. I found that pc is part of a series just by looking in /base/textures/tex_tech and seeing several pc_a, pc_b, pc_c, etc. In most cases, if something is part of a series it should be named so that the others appear next to it.
Other than that, the only thing you can do is fire up UFORadiant and have a look at the maps where the texture is used (listed in the link at the top of this thread). But in most cases just having a look in the /textures/ directory should do the trick.