The present invention relates to stable liquid, allophanate-modified, partially trimerized diphenylmethane diisocyanates, the prepolymers of these stable liquid, allophanate-modified, partially trimerized MDI’s, and to processes for the preparation of these compositions. The player reservation feature may be accessed at the gaming machine or remotely at another gaming machine or other device, e. The arrangement of security trace pairs are such that the second trace is arranged substantially parallel to the first trace. Connections between the shapes represent relationships between attributes in an OLAP dimension.