SA226 FLT CREW HAS RWY INCURSION ON RWY 32 AT PIT AFTER SKIDDING ON ICY TXWY. ACR JET IS DEPARTING ON RWY 32 AT THE TIME AND NARROWLY MISSES THE SA226.

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I FLEW THE APCH AND LNDG INTO PIT. CONDITIONS AT THE TIME WERE BEING RPTED AS 1 MI VISIBILITY WITH SNOW; INDEFINITE 900 FT CEILINGS; AND MU'S IN THE MID 20'S. RWY CONDITIONS DURING APCH WERE SEEN TO BE CONTAMINATED WITH LIGHT SNOW. DURING THE LNDG ROLL ON RWY 10R; THE ACFT SKID SLIGHTLY ON ICE; DIRECTIONAL CTL WAS MAINTAINED WITH SLIGHT DIFFERENTIAL PWR. WE SLOWED THE ACFT WITH THE THRUST REVERSERS ONLY AND DID NOT USE THE BRAKES TO CLR THE RWY. THE TXWYS WERE COVERED BY A LAYER OF SNOW MAKING IDENT OF ANY OTHER POSSIBLE HAZARDS OR CONTAMINANTS DIFFICULT. THE LAYER OF SNOW ALSO MADE SEEING THE TXWY CTRLINE AND MARKINGS DIFFICULT. WE EXITED THE RWY AT TXWY F3; AND WERE INSTRUCTED TO TAXI VIA TXWYS F AND R AND TO HOLD SHORT OF RWY 10C ON TXWY R. BEFORE REACHING THE HOLD SHORT LINE; WE WERE CLRED TO TAXI VIA TXWY R AND HOLD SHORT OF RWY 14/32. WE THEN ASKED FOR A DIFFERENT ROUTING VIA TXWY E. TWR THEN CLRED US VIA THE ROUTING; BUT ADVISED TO HOLD SHORT OF RWY 14/32. WE WERE TAXIING AT A SLIGHTLY SLOWER THAN NORMAL SPD. AS WE APCHED THE HOLD SHORT LINES THE ACFT'S BRAKES WERE APPLIED; BUT THE ACFT STARTED TO SKID ON THE ICE. MAX BRAKING WAS THEN APPLIED AND THE ACFT STILL WAS UNRESPONSIVE. THEN THE THRUST REVERSE SYS WAS APPLIED TO MAX REVERSE; BUT THE ACFT CONTINUED TO SLIDE FORWARD ON THE ICE. THE ACFT FINALLY CAME TO REST WITH APPROX 70% OF THE ACFT PAST THE HOLD SHORT LINE; WITH THE NOSE OF THE ACFT NEAR THE SIDE OF THE RWY. THE ACFT ALSO VEERED APPROX 20 DEGS R DURING THE SKID. IMMEDIATELY AS THE ACFT CAME TO A STOP; A HVT PASSED IN FRONT OF OUR ACFT AND ROTATED FOR FLT. THE HVT ACFT'S WINGTIP PASSED IN FRONT OUR ACFT BY APPROX 30-50 FT. THIS HAPPENED IN SUCH A SMALL AMOUNT OF TIME; THAT NOTIFICATION OF ATC THAT WE WERE SKIDDING WAS IMPOSSIBLE. ONCE THE HVT ROTATED AND BEGAN FLYING ATC ASKED IF WE WERE HOLDING SHORT OF THE RWY. WE IMMEDIATELY ADVISED THEM THAT WE HAD SKID THROUGH THE HOLD SHORT LINE. ATC THEN CLRED US TO CROSS THE RWY. THEY ALSO ADVISED US OF A PHONE NUMBER TO CONTACT THE TWR UPON SHUTDOWN. ONCE OUR ACFT WAS SHUT DOWN AND SECURED; I CALLED AND SPOKE WITH THE TWR SUPVR AND ADVISED HIM OF WHAT HAD HAPPENED. I THEN CONTACTED MY DIRECTOR OF OPS AND DIRECTOR OF INSPECTIONS AND INFORMED THEM OF THE SITUATION AND ASKED IF THERE WAS ANYTHING WE COULD CHK ON OUR ACFT. WE PROCEEDED WITH THE CHKS THAT WERE OUTLINED TO US; AND PROCEEDED TO CONTINUE WITH OUR DAY.