John Hartson, a son of Swansea, was captain for the night and saw one effort cleared off the line before getting himself booked after just 14 minutes.
On 22 minutes Wales went even closer when Carl Robinson's left-wing corner was met by a Hartson header which was hacked clear on the line.
For a supposed friendly this was a physical, sometimes nasty contest with Slovenian full-back Suad Filekovic three times getting away with assaults on Richard Duffy.
Finally, Matej Mavric was booked for tripping Sam Ricketts.
Toshack's collection of youngsters and old hands had the better of a draw with a side who may well reach next summer's World Cup and Wales could easily have snatched a winner in a second half that they dominated.
Wales (5-3-2): Coyne (Burnley); Duffy (Portsmouth), Page (Coventry), Gabbidon (West Ham), Partridge (Motherwell), Ricketts (Swansea); Fletcher (West Ham), Robinson (Sunderland), Vaughan (Crewe); Hartson (Celtic), Earnshaw (West Bromwich). Substitutes used: Williams (West Ham) for Earnshaw, 64.
Slovenia (4-4-2): B Mavric (Handanovic, 64); Cesar, Filekovic, MMavric (Sukalo, 45), Knavs; Acimovic (Cimirotic, 45), Zlogar, Ceh, Pokorn (Ilic, 64); Lavric (Rodic, 45), Komac. Substitutes not used: Brecko, Pecnik.
Referee: I Stokes (Ireland).
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