/prog/'s own esoteric language

Fun idea. Let's make our own programming language.
Conditions:
Must be somewhat useful like ABC.
Not limited to characters only. Can include words.
1 function per post.

IN B4event
    event trapping/handling
    including errors, intervals &stuff
KTHX

EXPERT PROGRAMMER
    assembly program
KTHX

I EETEDvar # or proc
nulls var/proc - integers/floats/whatsit set to 0, strings set to "", procs set to "end".

DO NOT WANTvar # or proc
clears var completely, including pointers. I EETED does this to booleans.

PROCproc CONSIDERED HARMFUL
stops any execution of proc, and future attempts at execution produce errors

VARvar CONSIDERED HARMFUL
for vehemently disusing variables

And, of course, attempts to use elements that are CONSIDERED HARMFUL, would be one of the events trapped by IN B4.