Starting with the 1.5.21 release of OpenAFS for Windows, the following syntax can be used to access any volume in any cell without requiring the creation of a mount point.
\\AFS\<cell><mount point type><volume>\
Where <cell> can be either a full cell name or an unambiguous prefix, the <mount point type> is '#' for a normal mount point or '%' to force the use of a read-write volume, and <volume> is either a volume name or its ID number.
Examples include:
\\AFS\athena.mit.edu#user.jaltman\
\\AFS\athena%user.jaltman\
\\AFS\athena.mit.edu# 537235559\