Any glass will melt in a kiln when you heat it up; fusing glass successfully depends on knowing how different glasses work together. I use a specially formulated glass that comes in many colours and is guaranteed together, thereby freeing up my creativity!
Fused glass techniques are generally used to create Art glass, glass tiles and jewellery, and slumping techniques (where glass is laid over a mold, generally made of ceramic or metal and forms to it) allow the creation of larger, functional pieces like dishes, bowls, plates, and vases. Producing functional pieces generally requires 2 or more separate firings, one to fuse the glass and a second slump it to shape. Art pieces such as sculpture or wall hangings may take any number of firings depending upon the effects you are trying to achieve.
Aside from firing the pieces in the kiln, they are generally cold worked as well for the finishing touch or to achieve a desired affect. Cold working involves the use of various grinders and saws and polishers and a lot of elbow grease at times! As well as sandblasting the glass surface, and other design factors such as airbrushing metallic lusters or glass paints.