If it is set to off , then no Tcl code is executed. If it is set to on , then Tcl code specified in tclForcesScript parameters is executed. This parameter may occur multiple times and scripts will be executed in order of appearance. At this point only low-level commands are defined. In the future this list will be expanded.
Request remains in effect until reconfig is called.
Returns a group ID which is of the form gN where N is a small integer. Aggregate forces may then be applied to the group as whole. Request remains in effect until reconfig is called. Old configuration is replaced by new configuration. Several vector routines from the VMD Tcl interface are also defined.