Handle continuation commands

[voughtdq]

call/[2,3] doesn't work as intended for continuation commands because the current implementation finds which PID to notify by looking them up by tag in the cmds tree.

Continuation commands don't have these tags and therefore will cause the call/[2.3] function to timeout.

I'm not sure of the best solution to this yet, so we will have to try a few different methods to see what works best.