Abstract: A single entity contains source lines, being operated on by one or more end users. Within the same entity are entity version and level control data. Individual source lines contain version-related identification variables. After each version or level update by a user, a comparison is made between new and old versions; source line identification variables are modified, and new source lines are added; dependent version information is stored in the entity, and control data is updated. Subsequent retrievals of a version are responsive to the dependent version information, and produce indications of any changes that had been made to dependent versions.

Abstract: A font used during the plugging of bowling ball finger holes consisting of an annular member defining a chamber placed upon the bowling ball surface about the finger hole to be plugged. The font body includes a base having a concave supporting surface corresponding to the configuration of the bowling ball, and attachment means attach the font to the ball during use. The font is formed of an easily machinable material, such as synthetic plastic, and may be simultaneously machined from the ball during machining of the plugging compound and resurfacing of the ball.